George Bush was "the worst thing ever to happen to Tony Blair", former foreign secretary David Miliband said.

Mr Miliband said the election of Bush was damning for the former PM as he discussed Blair's decision to join the US-led invasion of Iraq a decade ago, on ITV's The Agenda.

He contrasted that period with watching Blair go "through the agony" of deciding to intervene in Kosovo when Bill Clinton was in the White House.

"There's no question in my mind that if you compare that to the post-2001 period George Bush was the worst thing ever to happen to Tony Blair," he said.

"The first term of the Bush administration took America and the world on a very different course than had been set in the post Cold War period."

Miliband also called for a far stronger intervention in Syria.

"If the message to dictators around the world is that the West will never intervene - and that's the message that President Assad of Syria has got today - we're going to live in a very, very dangerous world."

The international community was "on the back foot", he said.

"The issue William Hague is raising this week - should we give more small arms - that's not really the issue because they're flooded with small arms in Syria.

"The issue is - is someone going to take on the Assad air force which is bombing his own cities?"

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  • US-POLITICS-INAUGURATION-SWEARING IN-OBAMA

    Beyonce performs the National Anthem as Vice-President Joe Biden (L), his wife Dr. Jill Biden (2nd L), his son Beau Biden (C background), former President Bill Clinton (far L) and wife, US Secretary of State Hillary Clinton (C-background), and US Justice Anthony Kennedy (R) listen during the 57th Presidential Inauguration ceremonial swearing-in at the US Capitol on January 21, 2013 in Washington, DC. AFP PHOTO/Jewel Samad (Photo credit should read JEWEL SAMAD/AFP/Getty Images)

  • Barack Obama Sworn In As U.S. President For A Second Term

    WASHINGTON, DC - JANUARY 21: Singer Beyonce performs the National Anthem as U.S. President Barack Obama looks on during the public ceremonial inauguration on the West Front of the U.S. Capitol January 21, 2013 in Washington, DC. Barack Obama was re-elected for a second term as President of the United States. (Photo by Alex Wong/Getty Images)

  • Barack Obama Sworn In As U.S. President For A Second Term

    WASHINGTON, DC - JANUARY 21: Singer Beyonce performs the National Anthem during the public ceremonial inauguration on the West Front of the U.S. Capitol January 21, 2013 in Washington, DC. Barack Obama was re-elected for a second term as President of the United States. (Photo by Mark Wilson/Getty Images)

  • US-POLITICS-INAUGURATION-SWEARING IN-OBAMA

    Beyonce and husband Jay-Z arrive for the 57th Presidential Inauguration ceremonial swearing-in of President Barack Obama at the US Capitol on January 21, 2013 in Washington, DC. The oath is to be administered by US Supreme Court Chief Justice John Roberts, Jr. AFP PHOTO/Jewel Samad (Photo credit should read JEWEL SAMAD/AFP/Getty Images)

  • US-POLITICS-INAUGURATION-SWEARING IN-OBAMA

    Beyonce and husband Jay-Z (far L) arrive for the 57th Presidential Inauguration ceremonial swearing-in of President Barack Obama at the US Capitol on January 21, 2013 in Washington, DC. The oath is to be administered by US Supreme Court Chief Justice John Roberts, Jr. AFP PHOTO/Jewel Samad (Photo credit should read JEWEL SAMAD/AFP/Getty Images)

  • Beyonce, Jay-Z

    Beyonce and Jay-Z arrive at the ceremonial swearing-in for President Barack Obama at the U.S. Capitol during the 57th Presidential Inauguration in Washington, Monday, Jan. 21, 2013. (AP Photo/Scott Andrews, Pool)

  • Jay-Z and Beyonce arrive at the ceremonial swearing-in for President Barack Obama at the U.S. Capitol during the 57th Presidential Inauguration in Washington, Monday, Jan. 21, 2013. (AP Photo/Pablo Martinez Monsivais)

  • Barack Obama Sworn In As U.S. President For A Second Term

    WASHINGTON, DC - JANUARY 21: Singer Beyonce performs the National Anthem during the public ceremonial inauguration on the West Front of the U.S. Capitol January 21, 2013 in Washington, DC. Barack Obama was re-elected for a second term as President of the United States. (Photo by Mark Wilson/Getty Images)

  • Jay-Z, Beyonce

    Recording artists Jay-Z and Beyonce arrive on the West Front of the Capitol in Washington, Monday, Jan. 21, 2013, for the Presidential Barack Obama's ceremonial swearing-in ceremony during the 57th Presidential Inauguration. (AP Photo/Win McNamee, Pool)

  • Beyonce sings the national anthem at the ceremonial swearing-in at the U.S. Capitol during the 57th Presidential Inauguration in Washington, Monday, Jan. 21, 2013. (AP Photo/Pablo Martinez Monsivais)

  • Barack Obama, Beyonce

    President Barack Obama greets singer Beyonce on the West Front of the Capitol in Washington, Monday, Jan. 21,2013, after she performed the National Anthem at the ceremonial swearing-in ceremony during the 57th Presidential Inauguration. (AP Photo/Win McNamee, Pool)

  • Beyonce sings the national anthem at the ceremonial swearing-in at the U.S. Capitol during the 57th Presidential Inauguration in Washington, Monday, Jan. 21, 2013. (AP Photo/Pablo Martinez Monsivais)

  • President Barack Obama and Vice President Joe Biden listens as Beyonce sings the national anthem at the ceremonial swearing-in at the U.S. Capitol during the 57th Presidential Inauguration in Washington, Monday, Jan. 21, 2013. (AP Photo/Pablo Martinez Monsivais)

  • Barack Obama, Beyonce

    President Barack Obama greets singer Beyonce on the West Front of the Capitol in Washington, Monday, Jan. 21, 2013, after she sang the National Anthem during the president's ceremonial swearing-in ceremony during the 57th Presidential Inauguration. (AP Photo/Win McNamee, Pool)

  • Vice President Joe Biden, right, watches as President Barack Obama greets Beyonce at the ceremonial swearing-in at the U.S. Capitol during the 57th Presidential Inauguration in Washington, Monday, Jan. 21, 2013. (AP Photo/Paul Sancya)

  • Vice President Joe Biden, right, watches as President Barack Obama kisses Beyonce at the ceremonial swearing-in at the U.S. Capitol during the 57th Presidential Inauguration in Washington, Monday, Jan. 21, 2013. (AP Photo/Paul Sancya)

  • Barack Obama, Beyonce

    President Barack Obama applauds singer Beyonce after she sang the National Anthem on the West Front of the Capitol in Washington, Monday, Jan. 21, 2013, during the president's ceremonial swearing-in ceremony during the 57th Presidential Inauguration. (Photo by Win McNamee/Getty Images)

  • President Barack Obama, left and Vice President Joe Biden listen as singer Beyonce sings the National Anthem at the ceremonial swearing-in on the West Front of the U.S. Capitol during the 57th Presidential Inauguration in Washington, Monday, Jan. 21, 2013. (AP Photo/Scott Andrews, Pool)

  • Beyonce. Barack Obama

    President Barack Obama as Beyonce sings the National Anthem at the ceremonial swearing-in at the U.S. Capitol during the 57th Presidential Inauguration in Washington, Monday, Jan. 21, 2013. (AP Photo/Carolyn Kaster)

  • Beyonce, Barack Obama

    President Barack Obama and the first family listens as Beyonce signs the National Anthem at the ceremonial swearing-in at the U.S. Capitol during the 57th Presidential Inauguration in Washington, Monday, Jan. 21, 2013. (AP Photo/Carolyn Kaster)

  • President Barack Obama kisses Beyonce after she sang the National Anthem at the ceremonial swearing-in on the West Front of the U.S. Capitol during the 57th Presidential Inauguration in Washington, Monday, Jan. 21, 2013. (AP Photo/Pablo Martinez Monsivais)

  • Beyonce sings the national anthem at the ceremonial swearing-in at the U.S. Capitol during the 57th Presidential Inauguration in Washington, Monday, Jan. 21, 2013. (AP Photo/Pablo Martinez Monsivais)

  • Beyonce

    Beyonce sings the National Anthem at the ceremonial swearing-in for President Barack Obama at the U.S. Capitol during the 57th Presidential Inauguration in Washington, Monday, Jan. 21, 2013. (AP Photo/Evan Vucci)

  • Beyonce, Barack Obama

    President Barack Obama talks to Beyonce before she sings the National Anthem at his ceremonial swearing-in at the U.S. Capitol during the 57th Presidential Inauguration in Washington, Monday, Jan. 21, 2013. (AP Photo/Evan Vucci)

  • Beyonce, Jay-Z

    Beyonce and Jay-Z arrive at the ceremonial swearing-in for President Barack Obama at the U.S. Capitol during the 57th Presidential Inauguration in Washington, Monday, Jan. 21, 2013. (AP Photo/Scott Andrews, Pool)

  • Barack Obama, Beyonce

    President Barack Obama greets singer Beyonce on the West Front of the Capitol in Washington, Monday, Jan. 21,2013, after she sang the national anthem at the ceremonial swearing-in ceremony during the 57th Presidential Inauguration. (AP Photo/Win McNamee, Pool)

  • Barack Obama Sworn In As U.S. President For A Second Term

    WASHINGTON, DC - JANUARY 21: Beyoncé performs the national anthem as U.S. President Barack Obama looks on during the presidential inauguration on the West Front of the U.S. Capitol January 21, 2013 in Washington, DC. Barack Obama was re-elected for a second term as President of the United States. (Photo by Alex Wong/Getty Images)

  • US-POLITICS-INAUGURATION-SWEARING IN-OBAMA

    Beyonce and husband Jay-Z arrive for the 57th Presidential Inauguration ceremonial swearing-in of President Barack Obama at the US Capitol on January 21, 2013 in Washington, DC. The oath is to be administered by US Supreme Court Chief Justice John Roberts, Jr. AFP PHOTO/Jewel Samad (Photo credit should read JEWEL SAMAD/AFP/Getty Images)

  • US-POLITICS-INAUGURATION-SWEARING IN-OBAMA

    Beyonce and husband Jay-Z arrive for the 57th Presidential Inauguration ceremonial swearing-in of President Barack Obama at the US Capitol on January 21, 2013 in Washington, DC. The oath is to be administered by US Supreme Court Chief Justice John Roberts, Jr. AFP PHOTO/Jewel Samad (Photo credit should read JEWEL SAMAD/AFP/Getty Images)

  • Barack Obama Sworn In As U.S. President For A Second Term

    WASHINGTON, DC - JANUARY 21: Beyoncé performs the national anthem as U.S. President Barack Obama looks on during the presidential inauguration on the West Front of the U.S. Capitol January 21, 2013 in Washington, DC. Barack Obama was re-elected for a second term as President of the United States. (Photo by Alex Wong/Getty Images)

  • Barack Obama Sworn In As U.S. President For A Second Term

    WASHINGTON, DC - JANUARY 21: (L-R)Martin Luther King III, Rev. Al Sharpton, Beyonce and Jay-Z pose for a photo during the public ceremonial inauguration for U.S. President Barack Obama on the West Front of the U.S. Capitol January 21, 2013 in Washington, DC. Barack Obama was re-elected for a second term as President of the United States. (Photo by Rob Carr/Getty Images)

  • US-POLITICS-INAUGURATION-SWEARING IN-OBAMA

    Beyonce and husband Jay-Z arrive for the 57th Presidential Inauguration ceremonial swearing-in of President Barack Obama at the US Capitol on January 21, 2013 in Washington, DC. The oath is to be administered by US Supreme Court Chief Justice John Roberts, Jr. AFP PHOTO/Jewel Samad (Photo credit should read JEWEL SAMAD/AFP/Getty Images)

  • US-POLITICS-INAUGURATION-SWEARING IN-OBAMA

    Beyonce and husband Jay-Z arrive for the 57th Presidential Inauguration ceremonial swearing-in of President Barack Obama at the US Capitol on January 21, 2013 in Washington, DC. The oath is to be administered by US Supreme Court Chief Justice John Roberts, Jr. AFP PHOTO/Jewel Samad (Photo credit should read JEWEL SAMAD/AFP/Getty Images)

  • US-POLITICS-INAUGURATION-SWEARING IN-OBAMA

    Beyonce and husband Jay-Z arrive for the 57th Presidential Inauguration ceremonial swearing-in of President Barack Obama at the US Capitol on January 21, 2013 in Washington, DC. The oath is to be administered by US Supreme Court Chief Justice John Roberts, Jr. AFP PHOTO/Jewel Samad (Photo credit should read JEWEL SAMAD/AFP/Getty Images)

  • Barack Obama Sworn In As U.S. President For A Second Term

    WASHINGTON, DC - JANUARY 21: Singer Beyonce performs the National Anthem as U.S. President Barack Obama looks on during the public ceremonial inauguration on the West Front of the U.S. Capitol January 21, 2013 in Washington, DC. Barack Obama was re-elected for a second term as President of the United States. (Photo by Alex Wong/Getty Images)

  • US-POLITICS-INAUGURATION-SWEARING IN-OBAMA

    President Barack Obama greets singer Beyonce during the 57th Presidential Inauguration ceremonial swearing-in at the US Capitol on January 21, 2013 in Washington, DC. AFP PHOTO/Jewel Samad (Photo credit should read JEWEL SAMAD/AFP/Getty Images)

  • US-POLITICS-INAUGURATION-SWEARING IN-OBAMA

    President Barack Obama, First Lady Michelle and daughter Malia listen to Beyonce sing the National Anthem during the 57th Presidential Inauguration ceremonial swearing-in at the US Capitol on January 21, 2013 in Washington, DC. AFP PHOTO/Jewel Samad (Photo credit should read JEWEL SAMAD/AFP/Getty Images)

  • Barack Obama Sworn In As U.S. President For A Second Term

    WASHINGTON, DC - JANUARY 21: Singer Beyonce performs the National Anthem as U.S. President Barack Obama looks on during the public ceremonial inauguration on the West Front of the U.S. Capitol January 21, 2013 in Washington, DC. Barack Obama was re-elected for a second term as President of the United States. (Photo by Alex Wong/Getty Images)

  • US-POLITICS-INAUGURATION-SWEARING IN-OBAMA

    Beyonce performs the National Anthem as Vice-President Joe Biden, his wife Dr. Jill Biden (2nd L), his son Beau Biden (C background), former President Bill Clinton (far L) and wife, US Secretary of State Hillary Clinton (C-background), and US Justice Anthony Kennedy (R) listen during the 57th Presidential Inauguration ceremonial swearing-in at the US Capitol on January 21, 2013 in Washington, DC. AFP PHOTO/Jewel Samad (Photo credit should read JEWEL SAMAD/AFP/Getty Images)

  • US-POLITICS-INAUGURATION-SWEARING IN-OBAMA

    President Barack Obama and First Lady Michelle Obama listen to Beyonce sing the National Anthem during the 57th Presidential Inauguration ceremonial swearing-in at the US Capitol on January 21, 2013 in Washington, DC. AFP PHOTO/Jewel Samad (Photo credit should read JEWEL SAMAD/AFP/Getty Images)

  • US-POLITICS-INAUGURATION-SWEARING IN-OBAMA

    Singer Beyonce and her husband Jay Z pose for a picture after Beyonce performed the national anthem at US President Barack Obama's ceremonial swearing-in at the US Capitol on January 21, 2013 in Washington, DC. AFP PHOTO/Brendan SMIALOWSKI (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)

  • US-POLITICS-INAUGURATION-SWEARING IN-OBAMA

    US First Lady Michelle Obama greets singer Beyonce after she performed the national anthem at US President Barack Obama's ceremonial swearing-in at the US Capitol on January 21, 2013 in Washington, DC. AFP PHOTO/Brendan SMIALOWSKI (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)

  • Barack Obama Sworn In As U.S. President For A Second Term

    WASHINGTON, DC - JANUARY 21: Recording artists Jay-Z and Beyonce arrive at the presidential inauguration on the West Front of the U.S. Capitol January 21, 2013 in Washington, DC. Barack Obama was re-elected for a second term as President of the United States. (Photo by Win McNamee/Getty Images)

  • Barack Obama Sworn In As U.S. President For A Second Term

    WASHINGTON, DC - JANUARY 21: Singer Beyonce performs the National Anthem during the public ceremonial inauguration for U.S. President Barack Obama on the West Front of the U.S. Capitol January 21, 2013 in Washington, DC. Barack Obama was re-elected for a second term as President of the United States. (Photo by John Moore/Getty Images)

  • Barack Obama Sworn In As U.S. President For A Second Term

    WASHINGTON, DC - JANUARY 21: Recording artists Jay-Z and Beyonce arrive at the presidential inauguration on the West Front of the U.S. Capitol January 21, 2013 in Washington, DC. Barack Obama was re-elected for a second term as President of the United States. (Photo by Win McNamee/Getty Images)

  • Barack Obama Sworn In As U.S. President For A Second Term

    WASHINGTON, DC - JANUARY 21: Recording artists Jay-Z and Beyonce arrive at the presidential inauguration on the West Front of the U.S. Capitol January 21, 2013 in Washington, DC. Barack Obama was re-elected for a second term as President of the United States. (Photo by Win McNamee/Getty Images)

  • Barack Obama Sworn In As U.S. President For A Second Term

    WASHINGTON, DC - JANUARY 21: First lady Michelle Obama (L) greets singer Beyonce after she performs the National Anthem during the public ceremonial inauguration for U.S. President Barack Obama on the West Front of the U.S. Capitol January 21, 2013 in Washington, DC. Barack Obama was re-elected for a second term as President of the United States. (Photo by John Moore/Getty Images)