A legal challenge has been filed against Texas's newly enacted congressional map, which plaintiffs claim is an unconstitutional racial gerrymander that dilutes the voting power of communities of color.

The Texas Senate on Saturday approved new congressional maps drawn to help Republicans win as many as five more House seats in next year’s midterm elections.

Republican lawmakers are pursuing the unusual mid-decade redistricting plan amid pressure from President Donald Trump to protect the GOP’s slim majority in the U.S. House.