The Trump administration barred people from 12 countries from entering the U.S., escalating the president’s crackdown on immigration. The ban, which goes into effect on Monday, affects travelers from Afghanistan, Chad, the Republic of Congo, Equatorial Guinea, Eritrea, Haiti, Iran, Libya, Myanmar, Somalia, Sudan and Yemen. There is also a partial ban on travelers from several other countries, including Burundi, Cuba, Laos, Sierra Leone, Togo, Turkmenistan and Venezuela. The order frames the reasoning for restricting travel as necessary because of national security threats. In his first term, President Trump banned travel from several Muslim-majority countries, including Iran.