A Trump-backed Republican will challenge the longest-serving woman in Congress after a rollercoaster contest that centered on allegiance to the former president.

Derek Merrin, an Ohio state lawmaker who earned former President Donald Trump’s endorsement on the eve of the election, won the primary for Ohio’s 9th Congressional District on Tuesday. He will now compete against Rep. Marcy Kaptur (R-OH), who has represented the Toledo area since 1983.