The map includes redrawn districts that would help defend the Republicans' slim House majority in next year's midterms.

The GOP-dominated Texas House is set to vote Monday on a new congressional district map that would flip five U.S. representative seats from Democrat to Republican – solidifying the party’s majority in Washington in time for next year’s midterm elections.

To conduct official business, at least 100 members of the 150-member Texas House must be present. Democrats hold 62 of the seats in the majority-Republican chamber. At least 51 Democratic members are leaving the state, said Josh Rush Nisenson, spokesperson for the House Democratic Caucus.