President Donald Trump is banning travelers from 12 countries and partially restricting travelers from seven others, starting on Monday. He announced the ban Wednesday in a proclamation that said the move will protect U.S. national security.

It’s an echo of Trump’s first term, when he signed an executive order blocking travelers from seven majority-Muslim countries. That ban led to protests at airports around the country, including in Minnesota, and a lengthy court battle.

Mitchell Hamline School of Law Professor Ana Pottratz Acosta joined Minnesota Now to provide insight into the latest ban.