Rep. Henry Cuellar, a Democrat, has won another term representing Texas' 28th Congressional District, beating Arthur Thomas.
With all precincts reporting, Cuellar has 84.4 percent of the vote, followed by Thomas with 15.6 percent.
Cuellar has represented the district in the House since 2005.
Democrats have gained a majority in the House, with 235 seats in the next Congress. All of Texas's House seats have been decided; two switched hands, all going to Democrats.
The number of votes cast for Democrats in House races has increased 55.0 percent from the 2014 midterms, compared with an increase of 25.6 percent for Republicans.
The district went for Democrat Hillary Clinton in 2016 by a margin of 19.7 points. President Trump, a Republican, won Texas by nine points.
Data is from the Associated Press. This story may be updated if more information becomes available. It is powered by Heliograf, The Post's artificial intelligence system.