Trump said the measure was spurred by a makeshift flamethrower attack on a Jewish protest in Colorado that US authorities blamed on an man they said was in the country illegally.

The move bans all travel to the United States by nationals of Afghanistan, Myanmar, Chad, Republic of the Congo, Equatorial Guinea, Eritrea, Haiti, Iran, Libya, Somalia, Sudan and Yemen.

Trump also imposed a partial ban on travelers from seven countries: Burundi, Cuba, Laos, Sierra Leone, Togo, Turkmenistan and Venezuela. Some temporary work visas from these countries will be allowed.

The bans go into effect on Monday, the White House said.