He posted a series of tweets from Camp David, the presidential retreat in Maryland, a few hours before holding meetings on the 2018 legislative agenda with Republican congressional leaders and Cabinet members.
It was his latest pushback against author Michael Wolff's Fire and Fury: Inside the Trump White House. The book draws a derogatory portrait of the 45th president as an undisciplined man-child who didn't actually want to win the White House, and who spends his evenings eating cheeseburgers in bed, watching television and talking on the telephone to old friends.
The book also quotes Trump's former chief strategist, Steve Bannon, and other prominent advisers as questioning the president's competence.
Trump is having none of it.
He tweeted that critics are “taking out the old Ronald Reagan playbook and screaming mental stability and intelligence”. The president said “actually, throughout my life, my two greatest assets have been mental stability and being, like, really smart”.
Trump said going from successful businessman to reality TV star to president on his first try “would qualify as not smart, but genius .... and a very stable genius at that!”
Reagan died in 2004, at age 93, from pneumonia complicated by the Alzheimer's disease that had progressively clouded his mind. At times when he was president, Reagan seemed forgetful and would lose his train of thought while talking.
Doctors, however, said Alzheimer's was not to blame, noting the disease was diagnosed years after he left office. Reagan announced his diagnosis in a letter to the American people in 1994, more than five years after leaving the White House.
Trump, now 71, was the oldest president ever when assuming office. Reagan was nearly eight months younger.
Chatter about Trump's mental fitness for office has intensified in recent months on cable news shows and among Democrats in Congress.
White House spokeswoman Sarah Huckabee Sanders this week called such suggestions “disgraceful and laughable”.
“If he was unfit, he probably wouldn't be sitting there and wouldn't have defeated the most qualified group of candidates the Republican Party has ever seen,” she said, calling him “an incredibly strong and good leader”.
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