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.

Even before President Donald Trump told Haitians this week they will no longer be welcome in the United States, travel from the crisis-wracked Caribbean nation was already difficult. It's been restricted by deadly gang violence,

When Trump included Haiti in a list of countries on which he was imposing a near-total travel ban, some saw a culmination of a long campaign against the population.