https://ballotpedia.org/United_States_Senate_election_in_Utah_(June_26,_2018_Republican_primary)
...Under the bylaws of the Republican Party of Utah, candidates seeking the party’s nomination are voted on at the party convention, which is scheduled for April 21, 2018.
Should a candidate receive 60 percent of the delegates’ votes, they win the nomination outright. Otherwise, the top two candidates advance to a June 26, 2018, primary election...
Thank you. Wonder why they would institute such a sensible rule, anyway? They are usually corrupt as all getout.