Migrants arriving at the U.S.-Mexico border are not entitled to apply for asylum until they set foot in the country, the Supreme Court ruled Thursday.

The 6-3 decision clears the way for the Trump administration to resume a policy that allows federal agents posted at the border to turn back asylum seekers before they enter the country. The case hinged on how to interpret immigration laws that say any noncitizen who “arrives in” the U.S. must be allowed to apply for asylum.