WASHINGTON, D.C.: Washington’s chief diplomat Rex Tillerson found himself obliged to defend President Donald Trump’s fitness for office on Friday (Saturday in Manila) after a bombshell new book called into doubt his mental health.

In an extraordinary portion of a television 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, whose office was last year forced to deny reports that he had referred to Trump as a “moron” after a national security meeting.

And, even in defending Trump, the former ExxonMobil chief executive admitted he has had to learn how to relay information to a president with a very different decision-making style.

“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.”