U.S. President Donald Trump urged Americans on Monday to halt most social activities for 15 days and not congregate in groups larger than 10 people in a newly aggressive effort to reduce the spread of the coronavirus in the United States.

Announcing new guidelines from his coronavirus task force, the president said people should avoid discretionary travel and not go to bars, restaurants, food courts or gyms.

As stocks tumbled, Trump warned that a recession was possible, a development that could affect his chances of re-election in November. The Republican president said he was focused on addressing the health crisis and that the economy would get better once that was in line.