US Donald Trump’s health is “excellent”, his mind is “sharp” and he only needs four or five hours’ sleep a night, the presidential physician said on Tuesday, The Guardian reported.

“Some people have just great genes,” a navy doctor, Ronny Jackson, told reporters at the White House. “I told the president that if he had a healthier diet over the last 20 years, he might live to be 200 years old ... But I would say the answer to your question is he has incredibly good genes and it’s just the way God made him.”

“He is fit for duty,” Jackson insisted, disappointing the president’s critics, then rubbing salt in their wounds. “I think he will remain fit for duty for the remainder of this term and even for the remainder of another term if he’s elected.”

“The president’s overall health is excellent,” Jackson said. “He had great findings across the board but his cardiac health stood out. Hands down he is in the excellent range ... He continues to enjoy the significant long-term cardiac and overall health benefits that come from a lifetime of abstinence from tobacco and alcohol.  I’ve never seen the president stressed out about too much ... He has a very unique ability to just get up in the morning and reset,” he noted.