SAN DIEGO (AP) — The Trump administration said Thursday that more than 1,800 children separated at the U.S.-Mexico border have been reunited with parents and sponsors but hundreds remain apart, signaling a potentially long wait for anguished families.

The federal government was under a Thursday deadline to reunify more than 2,500 children who were separated at the border from their parents under a new immigration policy designed to deter immigrants from coming here illegally. The policy quickly backfired amid global outrage from political and religious leaders and daily headlines about crying...