10 incumbent U.S. House lawmakers so far have lost their primaries while running in the 2026 election cycle, including three Republicans and seven Democrats.
https://www.foxnews.com/politics/10-house-incumbent-lawmakers-who-saw-2026-re-election-bids-end-primary-defeat
https://www.foxnews.com/politics/10-house-incumbent-lawmakers-who-saw-2026-re-election-bids-end-primary-defeat