As state leaders threaten a redraw of their maps, Republicans may have an advantage over their Democratic counterparts due to local laws impeding partisan gerrymandering attempts.

Texas House Democrats who fled their state to stall a Republican redistricting effort returned on Monday, ending their 15-day holdout.

AUSTIN, Texas (AP) — Texas Democrats ended a two-week walkout Monday that stalled Republican efforts to redraw congressional districts as part of a national partisan brawl over President Donald Trump’s desire to reshape U.S. House maps to his advantage.