Trump denies telling Comey to stop investigating Flynn, and the he lies about the Deputy Attorney General

During a press conference a reporter asked Donald Trump if he asked James Comey to stop the Michael Flynn investigation. Trump said "no, no" but then he lied about the reason why he fired him, claiming he was unpopular (he wasn't) and suggesting it was because of the letter written by the Deputy Attorney General. The problem is Trump told Lester Holt that letter was not the reason why he fired Comey, and that he was goin to fire him anyway. In other words, Trump lied again about why he fired Comey.

Why should be believe Trump, then, when he says "no, no", to the question about him asking Comey to stop the Flynn investigation?

Here's the video, of the press conference, by the way:

Most important moment: Trump just denied on camera that he urged Comey to close/back off Flynn investigation

Trump's word vs. Comey's memos pic.twitter.com/EEsGwuUEYI

— Bradd Jaffy (@BraddJaffy) May 18, 2017