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Senior Trump administration officials have rallied around the president following the release of a book that raised doubts over his mental health.
Michael Wolff's book Fire and Fury: Inside the Trump White House paints a damaging portrait of the US president.
But CIA chief Mike Pompeo told Fox News the portrayal was "pure fantasy" while policy adviser Stephen Miller told CNN Mr Trump was a "political genius".
Donald Trump too has continued to fight back against the book.
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President Reagan also faced questions over his mental health while in office, although some observers saw the comparison as unhelpful given he was later diagnosed with Alzheimer's disease.
The book has sparked a public rift between Mr Trump and his former strategist Steve Bannon, who is quoted as accusing Mr Trump's eldest son Donald Jr of "treasonous" behaviour in meeting a group of Russians.
But Mr Bannon appears to be trying to make amends. In a statement published by Axios website, he calls Donald Jr "a patriot and a good man" and says his support for the president is "unwavering".
White House aides spring to Mr Trump's defence
Speaking to Fox News, Mr Pompeo said allegations about the US president's lack of competence were "absurd, just pure fantasy".
While the book suggests Mr Trump lacks intellectual curiosity, Mr Pompeo said: "The president is engaged, he understands the complexity, he asks really difficult questions of our team at the CIA."
Mr Miller attacked Michael Wolff as "a garbage author of a garbage book".
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Michael Wolff's book Fire and Fury: Inside the Trump White House paints a damaging portrait of the US president.
But CIA chief Mike Pompeo told Fox News the portrayal was "pure fantasy" while policy adviser Stephen Miller told CNN Mr Trump was a "political genius".
Donald Trump too has continued to fight back against the book.
Skip Twitter post by @realDonaldTrump Report
End of Twitter post by @realDonaldTrump
President Reagan also faced questions over his mental health while in office, although some observers saw the comparison as unhelpful given he was later diagnosed with Alzheimer's disease.
The book has sparked a public rift between Mr Trump and his former strategist Steve Bannon, who is quoted as accusing Mr Trump's eldest son Donald Jr of "treasonous" behaviour in meeting a group of Russians.
But Mr Bannon appears to be trying to make amends. In a statement published by Axios website, he calls Donald Jr "a patriot and a good man" and says his support for the president is "unwavering".
- The debate over Trump's mental health
- Trump's fear of poisoning and other extraordinary claims
- Winners and losers from Bannon feud
White House aides spring to Mr Trump's defence
Speaking to Fox News, Mr Pompeo said allegations about the US president's lack of competence were "absurd, just pure fantasy".
While the book suggests Mr Trump lacks intellectual curiosity, Mr Pompeo said: "The president is engaged, he understands the complexity, he asks really difficult questions of our team at the CIA."
Mr Miller attacked Michael Wolff as "a garbage author of a garbage book".
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