Donald Trump has “incredible genes” and could have lived to 200 years old if his diet had been better in recent years, the White House presidential physician said.

Dr Ronny Jackson, who performed Mr Trump’s first medical exam as president, declared him “fit for duty” physically and mentally.

As well as a thorough physical, the US president asked to be administered a mental test and was given the Montreal Cognitive Assessment. Dr Jackson performed the “difficult” cognitive test and Mr Trump scored 30 out of 30.