The House speaker told Chris Wallace that Trump has failed a basic test of leadership.
"To succeed in this crisis," the House speaker wrote to colleagues, "we must insist on the truth."
The House speaker called on scientists to "speak up" against the president's falsehoods in an interview with "The Late Late Show" host James Corden.
US president calls the Russia inquiry "bullshit" and blasts "dirty cops".
"How hard is this?" Pete Souza said, with an Obama-era throwback pic.
Although not mentioned, the impeachment hearings dominated the State of the Union as Donald Trump seemed to ignore House Speaker Nancy Pelosi’s handshake, with her later tearing up his speech behind him.
“It was the courteous thing to do,” the Democrat House speaker says as bitter feud with US president continues.
President Donald Trump is expected to be tried over his highly controversial dealings with Ukrainian leadership.
The US president threatened to hit dozens of culturally and historically significant Iranian sites if the country sought revenge for the killing of Qassem Soleimani.
Expressing concerns about a potentially unfair trial, the House speaker would not commit to a timeline for sending the articles of impeachment to the Senate.