Trump framed the new restrictions, which primarily target African and Asian countries, as necessary to fortify national security and combat terrorism.

The president also placed travel restrictions on an additional list of countries as he reintroduced a controversial immigration policy that came to define the early days of his first term.

In addition to the ban, which takes effect at 12:01 a.m. Monday, there will be heightened restrictions on visitors from Burundi, Cuba, Laos, Sierra Leone, Togo, Turkmenistan and Venezuela. “I must act to protect the national security and national interest of the United States and its people,” Trump said in his proclamation.