Tillerson Backs Trump As Book Casts Mental Health Doubts

Washington's chief diplomat, Rex Tillerson found himself obliged to defend Trump's fitness for office on Friday after a bombshell new book called into doubt his mental health.

In an interview on foreign policy challenges, Tillerson was asked about claims that Trump has a short attention span, regularly repeats himself and refuses to read briefing notes.

"I've never questioned his mental fitness. I've had no reason to question his mental fitness," said Tillerson.

"I have to learn how he takes information in, processes it and makes decisions," Tillerson told CNN. 

"I'm here to serve his presidency. So I've had to spend a lot of time understanding how to best communicate with him."

Rex Tillerson insisted that the right decisions had been made and that the United States is in a stronger place internationally thanks to Trump's policies.

"He is not a typical president of the past, I think that's well recognized -- that's also why the American people chose him," he said, insisting that he does not expect to be asked to resign in the coming year.

Tillerson was forced to mount his defense as Washington devoured a new supposed tell-all -- Michael Wolff's "Fire and Fury: Inside the Trump White House" -- rushed into bookstores after the White House failed to suppress it.

The book quickly sold out in shops in the US capital, with some even lining up at midnight to get their hands on it and others circulating pirated copies. Trump has decried the instant best-seller as "phony" and "full of lies."

The 71-year-old Republican president, approaching the first anniversary of his inauguration, responded with fury.

"I authorized Zero access to White House (actually turned him down many times) for author of phony book! I never spoke to him for book. Full of lies, misrepresentations and sources that don't exist," Trump tweeted Thursday.

But Wolff countered: "I absolutely spoke to the president. Whether he realized it was an interview or not. I don't know, but it certainly was not off the record."

The book includes extensive quotes from Steve Bannon, Trump's former chief strategist, and its publication sparked a very public break between the former allies.

Bannon is quoted accusing Trump's eldest son Don Jr of "treasonous" contacts with a Kremlin-connected lawyer, and saying the president's daughter Ivanka, who imagines running for president one day, is "dumb as a brick."