A lawsuit accusing the Labor Department of allowing growers to pay agricultural workers on temporary visas less than what U.S. workers are making in the same area is moving forward.

Judge Randolph D. Moss of the U.S. District Court for the District of Columbia June 24 said a group of lawful permanent residents and a farmworkers’ union can continue their challenge to the alleged practice, despite the DOL’s assertion that it’s on the cusp of changing the regulations governing the H-2A agricultural guestworker program.

The proposed regulation has been under review by the White House Office of Management and Budget...