CNN host Jake Tapper clashed with senior White House policy adviser Stephen Miller over claims in "Fire & Fury: Inside The Trump White House", Michael Wolff's explosive new tell-all about President Donald Trump's campaign, presidential transition, and administration.
Mr. Wolff also repeated an assertion in the book that many in the White House had talked about the possible invocation of the 25th Amendment, a constitutional provision that permits a president's powers to be transferred to the vice president when the vice president and a majority of the cabinet or a body created by Congress conclude that the president is incapable of performing his duties. In the book, former White House chief strategist Steve Bannon makes a number of scathing critiques against Trump and his inner circle, including calling a meeting between Trump campaign officials with a Russian lawyer in Trump Tower during the presidential campaign "treasonous" and "unpatriotic".
Asked whether the president was aware of the meeting at the time, Miller said Bannon was not present and therefore "is not even a remotely credible source on any of it".
"The President's tweets absolutely reaffirm the plainspoken truth: A self-made billionaire revolutionized reality TV and tapped into something magical that's happening in the hearts of this country", Miller said.
Bannon, Miller said, wasn't even there.
Bannon claimed in his statement that the comments in the book were aimed not at Trump or his family but at Paul Manafort - Trump's former campaign chairman, who was sacked and is facing charges as part of special counsel Robert S. Muller's Russia investigation - who, Bannon said, should have known how the Russians - whom he called "duplicitous, cunning and not our friends" - operate.More news: Federal Bureau of Investigation documents: Andrew McCabe had no conflict in Hillary Clinton email probe
Wolff defended his work on Friday, insisting he spoke with Trump on the record and called the president "a man who has less credibility than, perhaps, anyone who has ever walked on earth".
Watch the clip above, via CNN. "And I think I've wasted enough of my viewers' time".
British Prime Minister Theresa May dismissed concerns about Mr Trump's mental state after the book's publication, saying the President would still be visiting the United Kingdom in the future.
"Don't be condescending, Jake", Miller shot back. The president later said on Twitter that Tapper "just got destroyed in his interview" with Miller.
"Steven, I'm trying to get to the issue of the president's fitness", Tapper said.
Later, Miller dodged another question about the president's fitness by attacking CNN for promoting "very fake news", and again proclaimed Trump's genius. "Thank you, Stephen", Tapper said.