Comprehensive immigration reform has eluded Congress for years. With border crossings at a record high, how are policymakers responding?

The U.S. Supreme Court is set to determine the fate of millions of undocumented immigrants and could influence how future presidents wield power.

President Donald J. Trump has wide latitude to enact the sweeping changes to U.S. foreign policy that he has promised, but his executive authority is constrained by congressional legislation, treaty …