The White House rapidly increased testing for those around President Trump Thursday after a staffer whose job potentially put him in close daily contact with the president had tested positive for the novel coronavirus. It’s the president’s closest known contact with an infected person since the early days of the U.S. response to the pandemic.

Covid-19 has killed more than 75,000 people in the United States, with around 1.25 million confirmed cases, according to tracking by The Washington Post.

Here are some significant developments: