Ten candidates are running in the Republican primary for Texas' 34th Congressional District on March 3, 2026. The filing deadline is December 8, 2025. Three candidates lead in media attention and fundraising: Eric Flores (R), Mayra Flores (R), and Scott Mandel (R).

Incumbent Vicente Gonzalez Jr. (D) is running for re-election in the Democratic primary. He was first elected to the district in 2022, defeating incumbent Mayra Flores 53% to 44%. Flores was first elected to the district in the June 2022 special election, receiving 51% of the vote. Flores advanced from the 2024 Republican primary for the district and faced Gonzalez in the 2024 general election, which Gonzalez won 51% to 49%.

Following Texas' 2025 congressional redistricting, Marijke Friedman of The Texas Tribune wrote that the new map "gives Republicans better odds to capture Gonzalez's South Texas district."

Eric Flores (no relation to Mayra Flores) is a lawyer and veteran of the U.S. Army and Texas Army National Guard. He previously served as an assistant U.S. Attorney for the Southern District of Texas. Flores is campaigning on his legal experience, saying he "led landmark prosecutions of cartel-connected and human trafficking operations" and worked on cases "defending municipalities and school districts across Texas." He says he would work to secure the country's borders while supporting legal immigration. Highlighting his military experience, Flores says he provided border security for Texas with the National Guard and that he would address veterans' issues.

Mayra Flores previously served as the representative for Texas' 34th Congressional District from 2022 to 2023. She is campaigning on her legislative experience "proudly [serving] South Texas on the Homeland Security and Agriculture Committees." She says she would focus on family issues and "put parents back in the driver seat [to] protect kids from those who wish to push their views on our families." Highlighting her experience immigrating to the United States from Mexico, Flores says, "We must secure our border to keep bad individuals out and to encourage legal immigration."

Mandel is a former law enforcement officer and business owner. Mandel is campaigning on his business's work in the security industry, saying he has "hands-on experience in border security operations" and that he would support "a full border shutdown once and for all." Mandel says he would grow the economy by reducing regulations and decreasing government spending, and he says he has seen "the systems causing much of the waste and inefficiencies" through his business's government contracts. Mandel says he would address veterans' issues and support changes to the Department of Veterans Affairs.

Also running in the primary are Keith Allen (R), Luis Buentello (R), Mauro Garza (R), Fred Hinojosa (R), Gregory Kunkle Jr. (R), Bam Morales (R), and Jay Nagy (R).

As of November 2025, The Cook Political Report with Amy Walter and Larry J. Sabato's Crystal Ball each rated the general election Lean Republican, and Inside Elections with Nathan Gonzales rated the general election a Toss-up.

To review how redistricting took place in Texas in 2025, click here. For a list of all states that drew new district lines between 2024 and 2026, click here.