President Donald Trump said Saturday that his administration will add the United Kingdom and Ireland to its European travel ban, a move to curb the spread of coronavirus that will further choke off travel between the U.S. and Europe amid the global coronavirus pandemic.

That ban, which took effect at midnight Friday, blocks foreign nationals from traveling from most countries in Europe to the U.S. for at least the next 30 days. American travelers can continue flying, but can only return via 13 major U.S. airports like Atlanta (ATL), New York City (JFK), Boston (BOS), and more, where they'll be subject to some additional health screening. The administration is also asking travelers to self-quarantine for 14 days after arriving.

The U.K. and Ireland were initially exempt from that ban. But as the count of confirmed coronavirus in the U.K. climbed, Trump's administration faced increasing pressure to add both countries to the ban.

Trump said during a Saturday news conference at the White House that both countries will be added to the travel ban. That addition takes effect at midnight on Monday.

Adding the United Kingdom and Ireland to the travel ban would further restrict air traffic to and from Europe as airlines are clamping down. On Friday, Delta announced it would suspend nearly all its flights to Europe for at least a month.

With these new restrictions, many more flights to Ireland and the U.K. will be forced to stop for at least the next month. That includes the new nonstop flight from Minneapolis-St. Paul (MSP) to Dublin (DUB), which Aer Lingus had already reduced through the summer.

This is a breaking news story. Check back for more updates.