Texas Democrats are in Illinois to block a vote on a new congressional map that aims to shore up Republicans power in Congress.

Illinois Gov. JB Pritzker vowed on late-night television to protect Texas House Democrats who fled to Illinois to try and stop the Republican-controlled state Legislature from redrawing congressional district boundaries to the GOP’s advantage ahead of next year’s midterm election.

Texas Democrats staying in Illinois after fleeing the state in opposition of Republican-led redistricting effort were evacuated from their hotel over a bomb threat, local law enforcement said on Wednesday.