Republicans hold 25 of Texas’ 38 congressional seats, with Democrats holding two of their 13 seats in districts that Trump carried in 2024. Had the new map been in place last year, Trump would have carried 30 congressional districts by 10 percentage points or more, making it likely that the GOP would have won that many seats as well.

A federal court in Texas on Tuesday blocked the state’s newly redrawn and Republican-friendly congressional map from going into effect in the 2026 midterm elections, dealing a blow to an effort by Tex...