Houston State District Court Judge Steven Kirkland has announced his candidacy for a seat on the all-Republican Texas Supreme Court, making him the first openly gay candidate to run for the state’s highest civil court.

Kirkland, a Democrat, is seeking Place 2 on the court, which is currently held by Justice Don Willett. Willett was nominated to the U.S. Court of Appeals for the Fifth Circuit by President Donald Trump in September, setting the stage for an open primary if Willett wins Senate confirmation.