More than 500 illegal migrants have been arrested, with several of them deported via military aircraft, as the Trump administration begins what it has dubbed the "largest mass deportation operation in history.

A new memo obtained by the New York Times tells ICE officials they can deport migrants even if they are in the country legally under temporary protections offered by the Biden administration.

Those who followed Biden-era guidelines are dismayed that the rules have changed. The app that helped them enter the country now may make them targets.