On December 11, 2025, the Indiana Senate voted 31-19 against a congressional redistricting map that was supported by President Donald Trump. This proposed map sought to eliminate the districts of Democratic Representatives Frank Mrvan and Andre Carson, thereby increasing Republican representation in a state where the GOP already holds seven of the nine U.S. House seats. The vote saw 21 Republicans joining 10 Democrats in opposition to the measure.

The rejection of the map follows a recent Supreme Court decision that allowed Texas to implement its own redistricting plan, which is expected to add five Republican-leaning House seats. Indiana's situation highlights the challenges faced by Trump in his broader campaign to reshape congressional districts ahead of the 2026 midterm elections, where Republicans are expected to encounter significant political challenges.

Indiana Democratic Party Chair Karen Tallian remarked that the decision to uphold the established redistricting rules was a responsible act aimed at maintaining the integrity of the legislative process. The redistricting bill had previously passed the Indiana House with a vote of 57-41, but faced greater scrutiny in the Senate, where Republican leaders expressed concerns about the lack of support for the proposed changes.

Senate Republican leader Rodric Bray had indicated that there was insufficient backing for the redistricting effort, which had become a contentious issue within the party. Trump had publicly criticized Bray and other lawmakers who opposed the redistricting, suggesting that they would face challenges in future primaries.

The push for redistricting is part of a broader trend in several Republican-controlled states, including Texas, Missouri, North Carolina, and Ohio, where new congressional maps are being drawn. In contrast, California voters recently passed Proposition 50, which temporarily shifts redistricting authority back to the state legislature, potentially resulting in additional Democratic-leaning districts. This ongoing redistricting battle underscores the significant political implications of district mapping and its impact on electoral outcomes.