Trump has vowed that mass deportation will be a day-one priority, saying he has “no choice” but to deport anyone who is in the U.S. illegally.

ROME (AP) — Pope Francis said Donald Trump’s plans to impose mass deportations of immigrants would be a “disgrace,” as he weighed in on the incoming U.S. president’s pledges nearly a decade after calling him “not Christian” for wanting to build a wall along the U.S.-Mexican border.

The incoming administration will need to clear a number of hurdles to enact its plan, immigration experts said.