Trump joins list of world leaders diagnosed with COVID-19.

President Trump announced in a tweet on Friday that he and first lady Melania Trump have tested positive for the coronavirus. The tweet sparked a flurry of messages from other world leaders, including British Prime Minister Boris Johnson, who was diagnosed with COVID-19 himself back in March. CBS News foreign correspondent Charlie D'Agata joined CBSN with more on Johnson's battle with the virus and how the British government handled it.

Subscribe to the CBS News Channel HERE: bit.ly/2uz8qYE

Watch CBSN live HERE: cbsn.ws/1PlLpZ7

Follow CBS News on Instagram HERE: www.instagram.com/cbsnews/

Like CBS News on Facebook HERE: facebook.com/cbsnews

Follow CBS News on Twitter HERE: twitter.com/cbsnews

Get the latest news and best in original reporting from CBS News delivered to your inbox. Subscribe to newsletters HERE: cbsn.ws/1RqHw7T

Get your news on the go! Download CBS News mobile apps HERE: cbsn.ws/1Xb1WC8

Get new episodes of shows you love across devices the next day, stream CBSN and local news live, and watch full seasons of CBS fan favorites like Star Trek Discovery anytime, anywhere with CBS All Access. Try it free! bit.ly/1OQA29B

---

CBSN is the first digital streaming news network that will allow Internet-connected consumers to watch live, anchored news coverage on their connected TV and other devices. At launch, the network is available 24/7 and makes all of the resources of CBS News available directly on digital platforms with live, anchored coverage 15 hours each weekday. CBSN. Always On.