The gay vice principal who was fired by his Catholic employer over his marriage has said he'll file a lawsuit.

Mark “Mr. Z” Zmuda, a popular teacher, coach and vice principal at Eastside Catholic School in Seattle, lost his job on December 18 after school officials learned that he had married his longtime partner over the summer.

Principal Polly Skinner has previously said that the firing was necessary because Eastside is “bound by Catholic teaching regarding same-sex marriage.”

According to Zmuda, a school official told him that he could keep his job if he consented to divorce his husband.

Students rallied to Zmuda's side and more than 20,000 Christians signed a petition calling on school administrators to reconsider their decision.

Zmuda is expected to discuss details about the suit on Friday, KIRO reported.