Rep. Diane Black lost the hotly contested Tennessee GOP gubernatorial primary on Thursday, making her the fifth House Republican this election cycle to lose a primary for statewide office.
It's a potentially ominous sign for Republicans as the party fights to hold its majority in Congress this fall.
Black, who had been considered the favorite in the race to be the GOP nominee in the Tennessee governor's race, joins a chain of fellow Republican House incumbents in Trump states who lost primary bids for higher offices.
Reps. Luke Messer and Todd Rokita both failed to clinch the Republican nomination in Indiana's Senate race. West Virginia Rep. Evan Jenkins lost to state Attorney General Patrick Morrisey in his bid to face Democratic incumbent Sen. Joe Manchin this November. Republican Rep. Raul Labrador lost his gubernatorial primary in Idaho.