Texas Attorney General Ken Paxton (R-TX) defeated incumbent U.S. Sen. John Cornyn (R-TX) in the Republican primary runoff on May 26, 2026 [1, 2, 3].
The victory marks a significant shift in the Texas GOP, as a Trump-endorsed challenger successfully ousted a long-term incumbent senator. This result underscores the continuing influence of former President Donald Trump over the Republican primary electorate in the state.
Paxton secured the GOP nomination after a competitive race that required a runoff because no candidate won a majority during the March primary [1, 2, 3]. The attorney general's campaign gained momentum following a late endorsement from Donald Trump, which helped Paxton capture the necessary vote share to win the seat [1, 2, 3].
Election officials said final polls across the state closed at 9 p.m. [3]. The runoff was conducted statewide, serving as the final step to determine who will represent the Republican Party in the general election for the U.S. Senate seat [1, 2, 3].
Paxton's win reflects a broader trend of party alignment within the Texas Republican base. The contest pitted the establishment wing of the party, represented by Cornyn, against the populist wing aligned with the former president's movement [1, 2, 3].
Gov. Greg Abbott and Donald Trump reacted to the outcome of the vote [4]. Paxton now moves forward as the presumptive Republican nominee, facing the general election to determine who will occupy the seat in Washington.
“Ken Paxton defeated incumbent U.S. Sen. John Cornyn in the Republican primary runoff.”
The defeat of Sen. Cornyn signifies a consolidation of power among the populist wing of the Texas Republican Party. By replacing a traditional institutionalist with a Trump-aligned figure, the GOP nomination shifts toward a more aggressive ideological profile heading into the general election, potentially altering the legislative dynamics of the U.S. Senate.
