After $13.5 million in spending, they ousted incumbents including Senate No. 3 leader Travis Holdman, with Club for Growth and pro-Trump groups heavily involved.
Allies said the wins strengthen Trump's grip on Indiana Republicans, advance efforts to reshape Senate leadership and support future congressional redistricting before 2028.
The results expand on earlier reports that at least five incumbents lost and open a month of primaries testing Trump's influence in races in Louisiana, Kentucky, Alabama and Georgia.
How did one state senator defy an $8 million campaign to keep his seat?
When outside money reshapes local politics, what does it mean for constituents?