WASHINGTON - Newly sworn-in U.S. President Donald Trump said on Monday that he would declare illegal immigration a national emergency, send troops to the U.S.-Mexico border, and reinstate his "remain in Mexico" policy as part of a sweeping immigration crackdown.

Migrants who are caught illegally crossing the US border will no longer be set free in the US while they await their immigration hearings. Instead, they’ll be taken into custody until they can be deported,