Texas Republicans are powering ahead with an aggressive strategy backed by President Donald Trump to seize control of multiple Democratic seats in next year’s critical midterm: redrawing the state’s congressional map in favor of more GOP seats.

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.

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.