President Donald Trump has signed a travel ban on 12 countries, primarily in Africa and the Middle East, from coming to America. The travel ban resurrects a hallmark policy of his first term that prevented large numbers of immigrants and visitors from entering the US. The ban, which goes into effect on Monday, bars travel to the US by citizens of Afghanistan, Myanmar, Chad, the Republic of Congo, Equatorial Guinea, Eritrea, Haiti, Iran, Libya, Somalia, Sudan and Yemen. The Republican president also imposed restrictions, but stopped short of a full ban, on travel from Burundi, Cuba, Laos, Sierra Leone, Togo, Turkmenistan and Venezuela. Trump’s first travel ban was issued in 2017 and banned travel to the US by citizens of seven predominantly Muslim countries. The order was retooled until a version was upheld by the Supreme Court in 2018. Trump has tied the new ban to Sunday's terror attack in Boulder, Colorado, saying it underscored the dangers posed by some visitors who overstay their visas. The suspect in the attack is from Egypt, a country that is not on Trump’s restricted list. The Department of Homeland Security says the suspect overstayed a tourist visa.