Texas Republicans have launched efforts to redraw congressional maps to secure more GOP seats in the U.S. House.

Dozens of Democratic state legislators fled Texas over the weekend, denying a quorum on Monday to Republicans hoping to vote on a new congressional map that heavily favors the GOP even more than its current districts.

The maps achieve a five-seat swing largely by shaving slivers of Republican strongholds from ruby red districts and placing them inside three urban districts.