As of August 13, 2026, ten incumbent House lawmakers have lost their primary elections, comprising three Republicans and seven Democrats. The Republican incumbents defeated include Dan Crenshaw of Texas, Thomas Massie of Kentucky, and Andy Ogles of Tennessee. The Democratic incumbents who lost are Al Green of Texas, Julie Johnson of Texas, Dan Goldman of New York, Adriano Espaillat of New York, Diana DeGette of Colorado, Shri Thanedar of Michigan, and John Larson of Connecticut.
Crenshaw lost the GOP primary for Texas' 2nd Congressional District to state Rep. Steve Toth, marking a significant shift as he did not receive an endorsement from former President Donald Trump. Massie was defeated by Trump-backed challenger Ed Gallrein in Kentucky's 4th Congressional District, in what has been reported as the most expensive U.S. House primary contest. Ogles lost to former state Agriculture Commissioner Charlie Hatcher in Tennessee's 5th Congressional District, despite having Trump's endorsement.
Among the Democrats, Thanedar lost to state Rep. Donavan McKinney in Michigan's 13th Congressional District. Goldman was defeated by former New York City Comptroller Brad Lander in New York's 10th Congressional District. Espaillat lost to Darializa Avila Chevalier in New York's 13th Congressional District, while DeGette was defeated by Melat Kiros in Colorado's 1st Congressional District. Green lost to Christian Menefee in Texas' 18th Congressional District, Johnson lost to Colin Allred in Texas' 33rd Congressional District, and Larson was defeated by former Hartford Mayor Luke Bronin in Connecticut's 1st Congressional District.