Birx pushes for a mask mandate as Major League Baseball faces a reckoning with the virus. It’s Tuesday, and this is your politics tip sheet. Sign up here to get On Politics in your inbox every weekday.

President Trump’s national security adviser, Robert O’Brien, is the latest member of the administration to test positive for the coronavirus. The White House announced yesterday that O’Brien had “mild symptoms” and was working remotely. It said that there had been “no risk of exposure to the president or the vice president.”

It has now been three weeks since the United States went through a day with fewer than 50,000 confirmed new coronavirus cases. Attempts to bring public life back online have tended to go sideways — just look at the Major League Baseball season, which started last week and is already on the rocks. The Miami Marlins postponed games scheduled for yesterday and today after at least 14 members of the team’s traveling party, including 12 players, tested positive for the virus.

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