The Republican majority on the North Carolina Supreme Court on Tuesday temporarily blocked the state election board from certifying the victory of one of the court’s own members—Democratic Justice Allison Riggs. In doing so, the state’s highest court laid the groundwork for potentially overturning the election and handing the seat to Riggs’ GOP challenger.

Riggs leads the race by 734 votes after two recounts. But her opponent, appeals court Judge Jefferson Griffin, has challenged the eligibility of 60,000 voters. He claims that ballots were wrongly counted from people who submitted incomplete voter registration records, but his list of challenged ballots includes many lawful voters—including Riggs’ own parents.