U.S. President Donald Trump, in a shift in rhetoric on facial coverings, encouraged Americans on Tuesday to wear a mask if they cannot maintain social distance from people around them in an effort to curb the spread of the coronavirus.

In his first briefing in months focused on the pandemic, Trump told reporters at the White House that the virus would probably get worse before it gets better, in one of his first acknowledgements in recent days of how bad the problem has become.

Trump, who downplayed the virus in its early stages and has been focused on reopening the economy in recent months despite an increase in cases, has been reluctant to wear a mask himself in public. He wore one for the first time in public during a recent visit to a military hospital but has otherwise eschewed putting one on in front of the press.