WASHINGTON—Rep. Steve King (R., Iowa), who was stripped of committee assignments last year for questioning what was wrong with white supremacy in the U.S., lost his bid for a 10th term after Republicans abandoned his campaign and endorsed a primary challenger.

Randy Feenstra, a state legislator, had 45.8% of the vote with 36 of 39 counties reporting, according to Iowa’s secretary of state. He was positioned to win a five-way primary, the Associated Press projected, and easily clear a 35% threshold that under state law allows…

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