MADISON — House Speaker Paul Ryan’s retirement creates an opening in his southeastern Wisconsin congressional district for the first time in 20 years, fueling hopes among Democrats that they can pick up the seat that leans Republican.

But a former Ryan aide from a prominent family in his hometown of Janesville is looking to keep the district bordering Illinois under GOP control, even if there’s a Democratic blue wave.

Bryan Steil, who won Ryan’s endorsement, won a five-way Republican primary Tuesday for the chance to run for Ryan’s 1st District seat in November.