President Donald Trump fires Veterans Affairs Secretary David Shulkin and nominates White House doctor Ronny Jackson to replace him following a bruising ethics scandal and a mounting rebellion within the agency.

US President Donald Trump passed a test for signs of dementia and is in overall excellent health, but needs to shed weight by cutting calories, fats and carbohydrates and starting a daily exercise routine, the White House physician says.

The White House physician pronounces Donald Trump to be in "excellent health" after Trump has his first medical exam as US president, capping off a week in which his mental fitness for the job has come under intense scrutiny.