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.

The biggest proposed changes are in Houston, the Dallas-area, Austin and South Texas, where several districts currently held by Democrats are remade to

Republicans in Texas currently hold 25 of the state’s 38 seats, and the new map ups the total they could win to 30. All of those new 30 seats were won by Trump in November by at least 10 percentage points, leading to conservative optimism they can hold them even in what’s likely to be a tough midterm environment for the party.