The Supreme Court is limiting how juries can decide retaliation lawsuits, saying victims must prove employers would not have taken action against them if not for their intent to retaliate.

The justices on Monday in a 5-4 decision sent back a doctor's discrimination lawsuit against the University of Texas Southwestern Medical Center.

Parkland Hospital withdrew Dr. Naiel Nassar's job offer after a former university supervisor opposed it. Nassar got $3 million in damages after saying the medical center retaliated against him for his discrimination complaints.

The medical center said the jury was told it only had to find retaliation was a motivating factor in the supervisor's actions.

Justices said the jury should have been told it had to find retaliation was the "but-for" reason behind the supervisor's actions.