Five challengers endorsed by President Donald Trump defeated Republican incumbents in Indiana state Senate primaries on Tuesday, showcasing the president's enduring influence within the GOP. Decision Desk HQ called the races in Districts 1, 11, 19, 21, and 41 for the Trump-backed candidates, who targeted senators who voted against the president's push for mid-decade redistricting last December.

The victories came amid heavy spending by pro-Trump PACs, which poured millions into the low-turnout primaries to oust the incumbents. Trump had vowed retribution after seven GOP senators joined Democrats to block a congressional map redraw that would have bolstered Republican chances in the 2026 midterms. Indiana remained the only red state to reject such a plan during Trump's second term.

In District 1, Trevor De Vries crushed incumbent Sen. Dan Dernulc with 75.1% of the vote to 23.3%. Brian Schmutzler beat Sen. Linda Rogers 58.9% to 41.1% in District 11. Blake Fiechter topped Sen. Travis Holdman 61.4% to 38.6% in District 19, while Tracey Powell defeated Sen. Jim Buck 64.7% to 35.3% in District 21. State Rep. Michelle Davis ousted Sen. Greg Walker 58.8% to 41.2% in District 41.

One race remained razor-thin. In District 23, incumbent Sen. Spencer Deery led Trump-endorsed Paul Copenhaver 6,334 votes to 6,331, a margin of three votes, with 99% of precincts reporting as of mid-morning Wednesday. NBC News listed it as too close to call. Separately, Sen. Greg Goode held off challenger Brenda Wilson 53.5% to 36.1% in District 38.

The targeted incumbents had faced intense pressure from Trump allies, including U.S. Sen. Jim Banks and Gov. Mike Braun. Super PACs like Hoosier Leadership for America and Club for Growth spent over $8 million on ads attacking the senators' redistricting votes. Banks hailed the results, stating, "President Trump is the single most popular Republican among Hoosier voters."

Defeated Sen. Travis Holdman called the effort "revenge and retribution," adding it was not a Christian value. Challenger Fiechter credited Trump's endorsement but pledged to follow his own instincts in office.

Republicans hold a 40-10 supermajority in the 50-seat Indiana Senate, with half the seats up in 2026. The wins could shift leadership dynamics and revive redistricting talks before November's general election. Trump also endorsed winner Jeff Ellington in open District 39, where he took 46.2% in a three-way race.