Republicans hold a 219-212 majority in the House, with four vacancies. New maps are typically drawn once a decade after the census is conducted. Many states, including Texas, give legislators the power to draw maps. California is among states that rely on an independent commission that is supposed to be nonpartisan.

Texas Republicans have ended a legislative session without approving new congressional maps but still plan to satisfy President Donald Trump’s wishes for redistricting that bolsters their party.