The former director of the FBI James Comey has said Donald Trump is "morally unfit" to be president.
Comey gave his first major TV interview since he was fired by Trump last year, saying that the President lies constantly and may have obstructed justice.
He was also asked whether he thought the President had been compromised by the Russians.
"I think it's possible, I don't know," he said. "I wish I wasn't saying it, but it's the truth. It always struck me, and still strikes me, as unlikely, and I would have been able to say with high confidence about any other president I dealt with, but I can't - it's possible."
"I don't buy this stuff about him being mentally incompetent or early stages of dementia," Comey told ABC. "He strikes me as a person of above average intelligence, who's tracking conversations and knows what's going on. I don't think he's medically unfit to be president. I think he's morally unfit to be president."
.@GStephanopoulos: “Is Donald Trump unfit to be president?”— ABC News (@ABC) April 16, 2018
@Comey: “Yes, but not in the way I often hear people talk about it...I don't think he's medically unfit to be president. I think he's morally unfit to be president.” https://t.co/nzGYlTmLXf #Comey pic.twitter.com/4eag9flFZ2
"Our president must embody, respect and adhere to the values that are at the core of this country. The most important truth. This president is not able to do that," Comey added.
The interview also marked the start of a promotional tour the former FBI director is carrying out to promote the release of his new book, A Higher Loyalty.
Trump's party via the Republican National Committee said after the ABC interview aired that Comey's publicity tour for the book reflected "his true higher loyalty is to himself", and "it's obvious Comey isn't credible".
On Twitter yesterday, Trump said he "hardly even knew this guy" about Comey, and said he will go down in history as "the worst FBI director".
Slippery James Comey, a man who always ends up badly and out of whack (he is not smart!), will go down as the WORST FBI Director in history, by far!— Donald J. Trump (@realDonaldTrump) April 15, 2018
I never asked Comey for Personal Loyalty. I hardly even knew this guy. Just another of his many lies. His “memos” are self serving and FAKE!— Donald J. Trump (@realDonaldTrump) April 15, 2018
During the 2016 presidential election when Comey was FBI director, he sent a letter to Congress saying the FBI was reopening an investigation into Hillary Clinton's emails, with the letter going public. Democrat candidate Clinton said it handed Trump the election.
When Trump became president, Comey has said he tried to get a pledge of personal loyalty from the FBI director, which Trump has denied.