Here is a closer look at why the administration says it is instituting full bans on foreign nationals traveling to the U.S. from 12 nations.

President Donald Trump has resurrected a hallmark policy of his first term, announcing that citizens of 12 countries would be banned from visiting the United States and those from seven others would f

Brazzaville, Equatorial Guinea, Eritrea, Haiti, Iran, Libya, Somalia, Sudan, and Yemen. Nationals from a further seven countries - Burundi, Cuba, Laos, Sierra Leone, Togo, Turkmenistan and Venezuela - will face partial travel restrictions.