(CNN) -- The Trump administration on Saturday expanded travel restrictions from Europe to include the United Kingdom and Ireland as it works to slow the spread of coronavirus.
Speaking from the White House briefing room, President Donald Trump also said he was considering restrictions on travel within the United States, though didn't specify details of the potential domestic bans.
The ban on foreign nationals entering the US from Britain or Ireland will begin at midnight on Monday, Vice President Mike Pence said. He added the decision had been made with the unanimous support of the President's health team.
It comes on top of restrictions on entry into the US from 26 countries in Europe that Trump announced on Wednesday. That ban went into effect at midnight on Friday, but only after the original announcement sparked chaos at European airports as Americans sought ways to return home before it went into place.
Like that ban, US citizens and their family members will be exempt. Unlike Trump's address to the nation, where he announced the initial European restrictions, Pence was explicit in saying that American citizens would still be able to return to the US.
Cargo from Britain and Ireland will also be exempt.
"They have had a little bit of activity, unfortunately, so we are going to be looking at that, actually we already have looked at it and that is going to be announced," Trump said Saturday during a news conference with his coronavirus task force at the White House.
Chad Wolf, the acting homeland security secretary, said US citizens traveling back from the UK or Ireland would be subject to self-quarantine.
The UK's exclusion from the initial travel restrictions raised questions because the case count in that country is higher than in other nations that were included. The White House said it wasn't included because it's not part of the Schengen Zone, where travels can cross borders without checks.
Seeking to explain Britain's exclusion on Thursday, Trump cited the country's "very strong borders" which he said helped keep the spread low.
"They don't have very much infection at this point, and hopefully they'll keep it that way," Trump said.
Still, the number of cases in the UK has surged this week. No phone calls between Trump and his British counterpart Boris Johnson have been announced, though the men are expected to partake in a videoconference of G7 leaders early next week.
Trump did meet in the Oval Office on Thursday with the Irish Taoiseach Leo Varadkar, who was visiting Washington for annual St. Patrick's Day diplomacy.
Varadkar said in remarks then that Ireland was in a "slightly different position" than other European nations because US Customs and Border Protection operates in some Irish airports and has asked travelers to the US which countries they have recently visited.
Asked in that meeting whether he could say that "Irish citizens (would) always be welcome to America throughout the coronavirus pandemic," Trump did not hint at the restrictions he announced two days later.
"Always," Trump said.