Texas Senate Runoff Pits Trump-Backed Paxton Against Incumbent Cornyn, With November Stakes High
Why It Matters
Texas Republicans head to the polls Tuesday for a high-stakes Senate primary runoff that could determine whether the party holds onto one of its most reliably red states. The outcome carries consequences well beyond Texas, with control of the U.S. Senate potentially in the balance during November’s midterm elections.
Democrats have not won a statewide race in Texas since 1994, but some Republican strategists are warning that nominating Attorney General Ken Paxton could open the door to a Democratic pickup — an outcome that would reshape the Senate’s partisan balance and affect President Trump’s legislative agenda for the remainder of his term.
What Happened
Texas voters are choosing between two Republican candidates: Ken Paxton, the state’s attorney general and a Trump-endorsed challenger, and John Cornyn, the incumbent senator who has represented Texas since 2002. The winner will face Democratic nominee James Talarico in the November general election.
President Trump endorsed Paxton, citing frustration with Cornyn and suggesting the incumbent had not stood by him during difficult moments. Senate Majority Leader John Thune had reportedly been working to secure a Cornyn endorsement from Trump before that effort fell short.
Cornyn, 74, is a Houston native who previously served as the state’s attorney general and as a Texas Supreme Court justice before entering the Senate. Despite voting in alignment with Trump on the vast majority of legislative matters, Cornyn was passed over in favor of Paxton for the president’s backing.
Paxton, 63, has centered his campaign on border security — including completing construction of the border wall — along with tax reduction and cryptocurrency development. His history of legal and ethical controversies, however, has drawn significant concern within his own party. He faces longstanding allegations involving securities fraud and other misconduct, and was among those who supported challenges to the 2020 election results.
By the Numbers
- 1994: The last year Democrats held a statewide office in Texas
- 99%: The rate at which Cornyn has voted in alignment with Trump, according to publicly available records
- 5–8 points: The estimated down-ballot decline for Republicans in a Paxton nomination scenario, per a poll commissioned by a pro-Cornyn super PAC
- 74 vs. 63: The ages of Cornyn and Paxton, respectively
- 2002: The year Cornyn first entered the Senate
Republican Concerns About Paxton
Several Texas Republicans have warned publicly that a Paxton nomination would be a gift to Democrats. State Representative Matt Shaheen posted on social media that Paxton “would be toast against Talarico” and could damage Republican candidates in down-ballot races across the state.
Mark Jones, a political science professor at Rice University, outlined the vulnerabilities Democrats could exploit in a general election campaign against Paxton. “There’s just so much to work with,” Jones said, pointing to allegations that include mortgage fraud, a dramatic increase in net worth while in public office, and ties to a disgraced investor whose legal matters Paxton’s office allegedly influenced.
A poll shared by a Texas political outlet — commissioned by Texans for a Conservative Majority, a super PAC supporting Cornyn — found that Paxton’s candidacy could cost Republicans five to eight percentage points in down-ballot contests. That margin would be enough to put traditionally safe Republican districts into play for Democrats.
For context on how the state’s primary structure may affect voter participation and party dynamics, see our earlier coverage of how Texas political parties run their primaries.
Zoom Out
The Texas runoff is unfolding within a broader midterm environment where Senate control is contested. A Democratic win in Texas would be the first since the 1990s and would move the party closer to reclaiming a Senate majority — which would restore Democratic leverage over executive nominations, including Cabinet officials, agency heads, and federal judges.
Trump’s endorsement of Paxton also reflects ongoing friction between the White House and Senate Republican leadership. Senior Republican figures have expressed concern that a Cornyn defeat could reduce cooperation from establishment Senate figures on the president’s remaining legislative priorities. Renee Cross of the University of Houston’s Hobby School of Public Affairs noted that the next six months could prove difficult for the Trump agenda if internal Senate dynamics shift.
The runoff also follows a recent special election in which Republican Brett Ligon won an open Texas Senate seat, underscoring continued Republican dominance in state-level contests — though analysts note federal races present a different electoral landscape.
What’s Next
Results from Tuesday’s runoff will determine which Republican advances to face Talarico in November. If Paxton wins, Democrats are expected to launch an advertising campaign drawing on his record of legal controversies. If Cornyn prevails, Republicans will argue the party is better positioned to hold the seat and protect down-ballot candidates. Either way, the Texas Senate race is expected to be among the most closely watched contests of the 2026 midterm cycle.