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.

President Donald Trump's sweeping new travel ban which bars citizens of twelve countries from entering the United States came into effect at 00:00 ET (05:00 BST) on Monday.

Some Canadian dual nationals who also have citizenship from one of 12 countries now banned from entering the United States say they're unsure whether they can still visit the country.