President Trump's new ban on travel to the U.S. by citizens from 12 mainly African and Middle Eastern countries has taken effect amid rising tension over the president's escalating campaign of immigration enforcement.

The travel ban forms part of Trump's policy to restrict immigration into the United States and is reminiscent of a similar move in his first term

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: How Trump justified the ban . Since returning to the White H