In a surprising political move, a state senator from northwest Indiana has expressed his stance after joining the majority in rejecting a redistricting proposal supported by former President Donald Trump on Thursday.

This decision is poised to stir political waters, but Republican Indiana State Senator Rick Niemeyer remains unfazed by the possibility of facing a primary challenge next year. Should it occur, he is prepared to confront it. Niemeyer believes his “no” vote against the proposed redistricting plan will not be a significant issue for his constituents.

ABC7 Chicago is now streaming 24/7. Click here to watch

The Indiana State Senate made waves on Thursday with a decisive 31-19 vote against the congressional maps championed by Trump, signaling a notable political defiance.

“The discussion from the opposition was intense, making it a difficult choice. I’ve been a lifelong Republican, upholding its values, and this decision was particularly challenging,” Niemeyer remarked.

Representing a district that spans parts of Lake County and neighboring southern counties, Niemeyer was among the 21 out of 40 state senators who opposed the redistricting plan. This plan aimed to redraw two Democratic-controlled districts to benefit Republicans.

“The outcome was astonishing, not just because it was defeated,” commented Stephen Caliendo, a Political Science Professor at North Central College. “Considering the predominantly Republican assembly, the negative vote was overwhelmingly unexpected.”

It was an effort to help Trump keep control of the U.S. House.

“I understood where the administration was coming from, and the importance of playing the game,” Niemeyer said.

Niemeyer said he voted on principle, because the old maps were drawn fairly for voters in northwest Indiana, and the proposed new 1st District seemed too gerrymandered.

“They put in seven counties, about 180 miles long, and it goes to other areas of the state that doesn’t fit what our community is, and we don’t fit them,” Niemeyer said.

ABC7 Political Analyst Laura Washington says new maps could have presented challenges for incumbent Republicans.

“They know where their districts are now. Why would they want to change midstream? Why would they want to go out and look for new voters to a lot of uncertainty in those new voters? They don’t know who those new voters are. So, redistricting is always perilous for elected officials,” Washington said.

Trump and Indiana Gov. Mike Braun have threatened consequences for those who voted against the new maps. Niemeyer hopes voters will consider his long record of service.

“If they don’t quite agree with me on this issue or agree I should’ve voted differently, I don’t think they’re going to use this issue to say, ‘No, we’re not going to vote for you anymore after all these years.’ But if they do, they do. That’s the process,” Niemeyer said.

He says he won’t lose any sleep over his vote.

“I was confident that I that I made the right decision that I needed to make for myself,” Niemeyer said.

Niemeyer says with Indiana Senate Republicans split over this remap vote, he hopes it will not cause a fracture within the caucus. He also hopes that they can still work together to get things done in Indiana.