The proposal would redraw district lines in ways that target current Democratic members of Congress in districts in South Texas and around Austin, Dallas and Houston.

Under the new map, Republicans are eyeing earning 30 seats in Congress — from their current 25 — partly by moving Cuellar and Gonzalez into districts Trump won by double digits. The proposal would also remove three Democratic-held seats in Houston, San Antonio and Dallas and create new districts that are potential Republican pickup opportunities.

How much could an unusual mid-decade redistricting push matter for control of Congress next year? Experts are split, but generally see little advantage in the frantic activity by both parties to squeeze extra seats from lines that already favor Republicans in Texas and Florida and Democrats in California.