United State President Donald Trump on Wednesday announced that citizens of 12 countries would be banned from visiting the country and those from seven others would face restrictions, effective from Monday at 12:01 a.m.

The ban includes Afghanistan, Myanmar, Chad, the Republic of Congo, Equatorial Guinea, Eritrea, Haiti, Iran, Libya, Somalia, Sudan and Yemen.

There will be heightened restrictions on visitors from Burundi, Cuba, Laos, Sierra Leone, Togo, Turkmenistan and Venezuela.

In a video released on social media, president Trump looped the ban to Sunday’s terror attack in Boulder, Colorado, saying it underscored the dangers posed by some visitors who overstay 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 he overstayed a tourist visa.

Trump said some countries had “deficient” screening and vetting or have historically refused to take back their own citizens.

 “We don’t want them,” he affirmed.

The Afghanistan ban makes exceptions for Afghans on Special Immigrant Visas, generally people who worked most closely with the U.S. government during the two-decade-long war there.

Trump wrote that Afghanistan “lacks a competent or cooperative central authority for issuing passports or civil documents and it does not have appropriate screening and vetting measures.” He also cited its visa overstay rates.

Haiti, which avoided the travel ban during Trump’s first term, was also included for high overstay rates and large numbers who came to the U.S. illegally.

Haitians continue to flee poverty, hunger and political instability deepens while police and a U.N.-backed mission fight a surge in gang violence, with armed men controlling at least 85% of its capital, Port-au-Prince.

“Haiti lacks a central authority with sufficient availability and dissemination of law enforcement information necessary to ensure its nationals do not undermine the national security of the United States,” Trump wrote.

Other Mideast nations on the list — Libya, Sudan and Yemen — all face ongoing civil strife and territory overseen by opposing factions. Sudan has an active war, while Yemen’s war is largely stalemated and Libyan forces remain armed.

The travel ban results from a Jan. 20 executive order Trump issued requiring the departments of State and Homeland Security and the Director of National Intelligence to compile a report on “hostile attitudes” toward the U.S. and whether entry from certain countries represented a national security risk.

During his first term, Trump issued an executive order in January 2017 banning travel to the U.S. by citizens of seven predominantly Muslim countries — Iraq, Syria, Iran, Sudan, Libya, Somalia and Yemen.

It was one of the most chaotic and confusing moments of his young presidency. Travelers from those nations were either barred from getting on their flights to the U.S. or detained at U.S. airports after they landed. They included students and faculty as well as businesspeople, tourists and people visiting friends and family.

The order, often referred to as the “Muslim ban” or the “travel ban,” was retooled amid legal challenges, until a version was upheld by the Supreme Court in 2018.