Trump’s travel ban 2.0: What countries are affected?

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President Trump has implemented a comprehensive travel ban affecting citizens from 12 countries while imposing heightened restrictions on seven others, marking a significant expansion of immigration enforcement policies from his first term.

The indefinite ban, which took effect Monday, primarily targets nations in Africa and the Middle East, with the administration citing national security concerns, terrorism risks and visa overstay issues as justification for the sweeping restrictions that will impact thousands of potential travelers and immigrants. Here are eight facts about the travel ban:

• The ban applies to citizens of 12 countries: Afghanistan, Myanmar, Chad, the Republic of Congo, Equatorial Guinea, Eritrea, Haiti, Iran, Libya, Somalia, Sudan and Yemen.

• Heightened restrictions affect people from seven additional countries (Burundi, Cuba, Laos, Sierra Leone, Togo, Turkmenistan and Venezuela) who are outside the U.S. and don’t hold valid visas.

• The policy took effect on Monday with no specified end date.

• Exceptions are made for Afghans on special immigrant visas, particularly those who worked with the U.S. government during the war.

• Previously issued visas from the 12 banned countries will not be revoked if they have already left the consular section.

• Visa applicants whose applications were approved but haven’t received their visas will be denied.

• Countries can be removed from the list if they make “material improvements” to their screening procedures.

• New countries can be added to the ban “as threats emerge around the world.”

Read more: Trump banned citizens of 12 countries from entering the U.S. Here’s what to know