The Texas Senate could vote Friday to approve new congressional maps drawn to help Republicans win as many as five more House seats in next year’s midterm elections.

The lawsuit, filed on behalf of 13 Texas residents, states that the redrawn districts in the new map — which Gov. Greg Abbott says he’ll “swiftly” sign into law — are racially discriminatory and violate voter protection laws.

The map’s passage was a major victory in President Trump’s push to get Republican state leaders to help his party keep control of the U.S. House.