There's been a surge of immigrants from the United States into Canada since the start of the Trump Administration, with the president's promise of a crackdown on undocumented immigration and his executive orders seeking to ban immigrants from certain countries. The immigrants typically cross over the northern U.S. border on foot and in the cover of darkness -- men, women and children seeking asylum in Canada, where they believe there's a lower risk of detention and deportation. NewsHour Weekend Special Correspondent Lisa Desai went to Canada to see who's fleeing the U.S. and why.