DAKAR, Senegal (AP) — President Donald Trump has banned citizens of 12 countries from entering the United States and restricted access for those from seven others, citing national security concerns in resurrecting and expanding a hallmark policy from his first term that will mostly affect people from Africa and the Middle East.

The ban announced Wednesday applies to citizens of Afghanistan, Myanmar, Chad, the Republic of Congo, Equatorial Guinea, Eritrea, Haiti, Iran, Libya, Somalia, Sudan and Yemen. The heightened restrictions apply to people from Burundi, Cuba, Laos, Sierra Leone, Togo, Turkmenistan and Venezuela who are outside the U.S. and don't hold a valid visa.

The policy takes effect Monday at 12:01 a.m. and does not have an end date.

Here's what to know about the new rules:

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