Trump-backed Michael Alfonso won a crowded Republican primary to succeed his father-in-law, Transportation Secretary Sean Duffy, in a former Wisconsin congressional seat. The result gives Alfonso the party’s nomination and makes him a prominent Republican contender heading into the general election.

Alfonso is married to Duffy and Fox News host Rachel Campos-Duffy’s daughter, linking his campaign to a well-known conservative political family. Donald Trump’s backing was a significant factor in a multi-candidate primary, underlining the continuing influence of presidential endorsements in Republican contests.