The Supreme Court of the United States on Monday formally reinstated a revised Texas congressional map backed by Republicans, reversing a lower court ruling and allowing the state to proceed with district lines that could impact control of the U.S. House.

The map, approved in 2025 by the Republican-led Texas legislature and signed by Gov. Greg Abbott, was designed to redraw multiple districts in a way that could shift several Democrat-held seats toward Republicans.

The decision formalizes an earlier interim ruling issued by the court in December, with the court’s conservative majority again prevailing. The three liberal justices dissented, maintaining objections raised in prior proceedings.

A lower federal court had previously blocked the map, finding it was likely to violate constitutional protections by discriminating based on race. The Supreme Court’s ruling overturns that decision, allowing the revised districts to be used moving forward.

The redistricting effort followed calls from President Donald Trump for Republican-controlled states to revisit congressional maps ahead of the election cycle, as both parties look to secure narrow margins in Congress.

The Texas map could influence as many as five competitive House districts, potentially affecting the balance of power in the chamber, where Republicans currently hold a slim majority.

Redistricting typically occurs once every decade following the U.S. census, but mid-decade adjustments have increasingly been pursued by both Republican- and Democrat-led states seeking electoral advantages.

In a separate development earlier this year, the court allowed a Democrat-backed redistricting plan in California to move forward, underscoring the broader national impact of ongoing legal battles over congressional maps.

With control of Congress closely contested, the outcome of these redistricting efforts is expected to play a significant role in upcoming federal elections and the legislative agenda that follows.