Ken Paxton defeats John Cornyn in Texas GOP Senate runoff

Texas Attorney General Ken Paxton (R-TX) won the Republican runoff for a U.S. Senate seat on Tuesday, defeating incumbent Senator John Cornyn (R-TX).

The result marks a significant shift in the state's political leadership. By removing a long-term incumbent, Republican voters have signaled a preference for the Trump-endorsed platform represented by Paxton over the established tenure of Cornyn.

The runoff election took place on May 26, 2026 ^[3]. Paxton's victory comes after a bitter primary battle that pitted the state's top legal officer against a veteran of the U.S. Senate. The defeat ends the legislative run of Cornyn, who had served four terms in the Senate ^[1].

Cornyn's tenure in the upper chamber spanned roughly two decades ^[2]. Throughout his time in Washington, he established himself as a key figure in the Republican caucus. However, the primary challenge from Paxton reflected a growing divide within the party between traditional conservatism and the movement led by former President Donald Trump.

Paxton campaigned as a staunch ally of the former president, a position that resonated with the Republican base during the runoff. The victory ensures that Paxton will be the GOP nominee as the general election approaches. The shift in representation may alter the dynamics of the Texas delegation in Washington, replacing a seasoned legislator with an official known for his aggressive legal challenges against federal mandates.

Because the runoff concluded on Tuesday, the focus now shifts to the general election. Paxton must now consolidate support across the state to maintain the seat for the Republican party. The transition from the Attorney General's office to the Senate will also require the appointment of a new top legal officer in Texas.