The Trump administration is making it more difficult for migrants traveling through Central America to seek and obtain asylum protections when they cross the southern border.

The Departments of Homeland Security and Justice released a new rule Monday under which migrants who enter the United States at the southern border are ineligible for asylum unless they sought protection in one of the countries they traveled through first. The measure, an effort to stem the flow of migrants from Central America into the U.S., is expected to take effect Tuesday.