Texas Republicans approved a new, aggressively gerrymandered congressional map early Saturday morning, moving forward with a power grab pushed by President Donald Trump.

The GOP-controlled state Senate approved the map on a party-line vote after hours of debate that began Friday morning. Republicans used a procedural move to block a Democratic senator’s plans to filibuster the bill, forcing it to a vote — one final show of force from GOP leadership after weeks of partisan fighting.

The map could ultimately help flip as many as five seats for the GOP starting with next year’s midterms. Republican Gov. Greg Abbott is set to quickly sign the legislation, capping off a turbulent few weeks in Texas over Republicans’ now-successful effort to further skew the maps in the GOP’s favor ahead of the 2030 census.

Under the new map, Republicans in Texas are aiming to earn 30 House seats — up from their current 25 — as they attempt to hold onto control of the chamber in what could be an unfavorable environment for them next year. Republicans currently have just a three-seat majority in the House, so the new Texas map alone will significantly affect their chances.

The unusual offcycle redistricting effort in Texas has set off a contentious national tit-for-tat. California formally launched its preemptive retaliation on Thursday, with lawmakers approving a ballot measure redrawing the state’s map to create five new Democratic seats to offset Texas. That measure —which would temporarily circumvent the state’s independent redistricting commission — now goes to voters on the November ballot, a gerrymander Democratic Gov. Gavin Newsom has cast as necessary to preserve democracy.