Texas Democrats have left the state in an attempt to prevent the state House from holding a vote Monday on new congressional maps that Republicans hope will net them several additional U.S.

Texas Democrats pushed back on the Republican effort to rewrite the state’s congressional map by leaving the state Sunday, to prevent a quorum needed to advance the measure in the Texas House.

There are 150 members of the Texas House, but 100 — a quorum — are needed to conduct business. The House Democratic Caucus announced Sunday afternoon that the majority of Democratic members would break quorum and leave the state ahead of floor debate scheduled for Monday on a proposed congressional map.