With just 12 days to go until the US presidential election, Barack Obama has reportedly described Mitt Romney as a "bullshitter".

According to Politico.com's Mike Allen Obama made the comments during an interview with Rolling Stone's Douglas Brinkley.

Brinkley wrote: "We arrived at the Oval Office for our 45-minute interview ... on the morning of October 11th. ... As we left the Oval Office, executive editor Eric Bates told Obama that he had asked his six-year-old if there was anything she wanted him to say to the president. ... She said, 'Tell him: You can do it.' "Obama grinned. ... 'You know, kids have good instincts,' Obama offered. 'They look at the other guy and say, "Well, that's a bullshitter, I can tell."'

During the second presidential debate Obama repeatedly found various more polite ways to accuse Romney of not telling the truth.

"What Governor Romney just said just isn't true,” the president said when responding to one Romney attack on the economy. “Not true,” Obama repeated at several points during the debate.

Similarly vice president Joe Biden managed to find various ways to accuse Paul Ryan of making things up including accusing him of engaging in "malarkey".

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    President Barack Obama greets supporters in the audience after speaking during a campaign event at Doolittle Park, Wednesday, Oct. 24, 2012, in Las Vegas. (AP Photo/Pablo Martinez Monsivais)

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    President Barack Obama embraces a supporter during a campaign event at Doolittle Park, Wednesday, Oct. 24, 2012, in Las Vegas. (AP Photo/Pablo Martinez Monsivais)

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    US President Barack Obama greets supporters during a campaign event October 24, 2012 at Doolittle Park in Las Vegas, Nevada. AFP PHOTO/Mandel NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)

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    Singer Katy Perry performs before the arrival of President Barack Obama at a campaign rally, Wednesday, Oct. 24, 2012, in Las Vegas. (AP Photo/Julie Jacobson)

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    Singer Katy Perry performs for a crowd before the arrival of President Barack Obama at a campaign rally, Wednesday, Oct. 24, 2012, in Las Vegas. (AP Photo/Julie Jacobson)

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    President Barack Obama speaks during a campaign rally, Wednesday, Oct. 24, 2012, in Las Vegas. The president is on a two-day tour of key battleground states that included stops in Iowa and Colorado on Wednesday and was scheduled to head to Florida, Virginia and Ohio on Thursday. (AP Photo/Julie Jacobson)

  • Barack Obama

    President Barack Obama speaks during a campaign rally, Wednesday, Oct. 24, 2012, in Las Vegas. The president is on a two-day tour of key battleground states that included stops in Iowa and Colorado on Wednesday and was scheduled to head to Florida, Virginia and Ohio on Thursday. (AP Photo/Julie Jacobson)

  • Supporters react during a speech by President Barack Obama at a campaign rally, Wednesday, Oct. 24, 2012, in Las Vegas. The president is on a two-day tour of key battleground states that included stops in Iowa and Colorado on Wednesday and was scheduled to head to Florida, Virginia and Ohio on Thursday. (AP Photo/Julie Jacobson)

  • Barack Obama

    President Barack Obama greets supporters after speaking at a campaign rally, Wednesday, Oct. 24, 2012, in Las Vegas. The president is on a two-day tour of key battleground states that included stops in Iowa and Colorado on Wednesday and was scheduled to head to Florida, Virginia and Ohio on Thursday. (AP Photo/Julie Jacobson)

  • Barack Obama

    President Barack Obama applauds with the crowd after speaking at a campaign rally, Wednesday, Oct. 24, 2012, in Las Vegas. The president is on a two-day tour of key battleground states that included stops in Iowa and Colorado on Wednesday and was scheduled to head to Florida, Virginia and Ohio on Thursday. (AP Photo/Julie Jacobson)

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    President Barack Obama holds up a hard copy of his economic plan while speaking at a campaign rally, Wednesday, Oct. 24, 2012, in Las Vegas. The president is on a two-day tour of key battleground states that included stops in Iowa and Colorado on Wednesday and was scheduled to head to Florida, Virginia and Ohio on Thursday. (AP Photo/Julie Jacobson)

  • Katy Perry

    Singer Katy Perry performs for a crowd before the arrival of President Barack Obama at a campaign rally, Wednesday, Oct. 24, 2012, in Las Vegas. (AP Photo/Julie Jacobson)