President Donald Trump felt compelled to let the world know he's playing with all his marbles and is among the sharpest cookies around.
In a series of tweets, Trump defended his mental fitness and boasted about his brains, saying he is "like, really smart" and "a very stable genius."
It was the latest pushback against a new book that portrays him as a leader who doesn't understand the weight of his office and whose competence is questioned by aides.
"Actually, throughout my life, my two greatest assets have been mental stability and being, like, really smart," Trump tweeted from Camp David, the presidential retreat in Maryland, a few hours before a strategy session on the 2018 legislative agenda with Republican congressional leaders and Cabinet members.
And when Trump addressed reporters later, the Ivy League graduate was ready for the question.
"I went to the best colleges for college," said Trump, who holds a bachelor's degree from the University of Pennsylvania. "I had a situation where I was a very excellent student, came out, made billions and billions of dollars, became one of the top business people, went to television and for 10 years was a tremendous success, as you probably have heard, ran for president one time and won."
His ire was directed at Michael Wolff, author of 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.
"I consider it a work of fiction," Trump told reporters, then bemoaned the country's "very weak" libel laws.
"I don't know this man," Trump said of the author. "I guess sloppy Steve brought him in the White House quite a bit and it was one of those things. That's why sloppy Steve is now looking for a job."
In one of his morning tweets, the president said his journey from "VERY 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!"
Trump's chief of staff, John Kelly, who has tried to bring order to a chaotic White House, said he had not seen the tweets until reporters showed them to him just before Trump spoke about noon.
But he said that Trump didn't appear angry Friday or Saturday. "I thought he would be, frankly," Kelly said.
As for the tweets: "He feels he can go around the press and get his perspective out by tweeting," explained Kelly. "That's kind of why he does it."