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.

Republican lawmakers pushed the map through over fierce Democratic opposition, positioning the GOP to net up to five additional seats in Texas.

The Republican-controlled Texas state Senate passed the party’s new congressional maps late Friday, completing a legislative odyssey that included significant Democratic delays and sparked a nationwide scramble over redistricting in the process.