Governors' Wind Energy Coalition

Representative Randy Feenstra lost the G.O.P. nomination for governor of Iowa to an opponent making his first run for office. It ended a streak of victories for primary candidates carrying the president’s endorsement.

Republican voters in Iowa dealt a shock defeat to President Trump on Tuesday, narrowly rejecting his chosen candidate for governor in favor of another conservative contender who ran as a political outsider.

The primary loss for Representative Randy Feenstra, whom the president endorsed on Friday afternoon, came at a time of mixed signals of Mr. Trump’s power over the Republican Party. He has won a series of dominant primary victories over Republican opponents, but has faced rising pushback from his party in Congress.