Donald Trump on June 5 signed a ban on travel to the US from 12 countries, citing national security risks, according to the White House.
The US president said the list could be revised if "material improvements" were made and additional countries could also be added as "threats emerge around the world".
This is the second time he has ordered a ban on travel from certain countries.
He signed a similar order in 2017, during his first term in office.
The White House said these "common sense restrictions" would "protect Americans from dangerous foreign actors".
