Voters in Indiana’s May 5, 2026, Republican primaries ousted a majority of state Senate incumbents who had opposed President Donald Trump’s push for a rare mid-decade congressional redistricting plan, according to early results reported by The Associated Press. Trump had endorsed challengers in most of those races after the plan failed in the legislature late last year.
Indiana Republicans who broke with President Donald Trump over a proposed mid-decade congressional redistricting plan faced a wave of Trump-endorsed challengers in Tuesday’s primaries, and several incumbents were defeated.
The Associated Press reported that a majority of the GOP state senators targeted in those contests lost their races on May 5, 2026, delivering an intraparty win for Trump after Indiana lawmakers rejected a redistricting proposal late last year.
Trump had publicly urged Republican voters to replace the senators who opposed the plan, including in a Truth Social post calling for the lawmakers to be “primaried,” and he issued endorsements for challengers in many of the races.
The contests drew unusual national attention—and outside money—for normally low-profile state Senate primaries. Public reporting ahead of Election Day documented millions of dollars in spending by groups on both sides, though totals varied by outlet and methodology.
The results were among the clearest early indicators in 2026 of how effectively Trump can translate endorsements into primary wins inside the Republican Party, months before the November midterm elections that will decide control of Congress.
