The Republican-dominated Legislature in Texas on Wednesday unveiled an aggressively redrawn map for the state’s U.S. House districts, proposing to carve up five Democratic seats so that Republicans would now be likely to win them in 2026.

The redrawn map was condemned by Democrats as a baldly partisan attempt at a rare mid-decade redistricting that has been pushed for months by President Trump and accepted by Gov. Greg Abbott and the Republican leaders of Texas.

It fulfilled the president’s central demand: five additional Republican seats in Congress that could help the party keep control of the U.S. House after the midterm elections next year. Mr. Trump is pressing Republican legislatures in Missouri, Indiana and elsewhere to follow Texas’ lead.

Beyond possible litigation, Texas Democrats may be powerless to stop the Republicans from moving ahead with redrawing districts to flip Democratic seats in deeply blue Dallas, Houston and Austin, and to win control of two highly competitive areas of the Rio Grande Valley along the U.S.-Mexican border.

And the map did not appear to seriously weaken Republican incumbents, which Democrats had hoped could be an inadvertent result of any aggressive effort to grab more seats in the state.

“When they know they can’t win, they cheat!” declared Representative Vicente Gonzalez, a Democrat who narrowly won re-election last year in a border district that is redrawn in the proposed map to favor Republicans.