Trump broke the news himself on his favourite social media platform, Twitter.
The president announced that his wife, Melania Trump, has also tested positive for COVID-19 and that they are both heading into quarantine immediately.
It took Trump a long time to wear a mask as the virus engulfed the world, shut down economies and killed millions.
Wearing a mask became a campaign and political issue in the U.S., with Trump rallies and events filled with people who wouldn’t wear masks.
Trump’s political base has been referred to as anti-maskers, and the media has taken turns to bash the president for his slow and tepid response to containing the virus.