“When the Constitution was tested, Cornyn stayed quiet”: GOP rocked after former federal investigator accuses Texas senator of failing the state and backing unqualified Trump allies in bombshell endorsement

Texas – A political storm is building in Texas after former FBI official Matthew DeSarno publicly backed Democratic state Rep. James Talarico for the U.S. Senate while delivering a blistering attack on Republican Sen. John Cornyn and Texas Attorney General Ken Paxton.

The endorsement, published in the conservative-leaning Dallas Morning News, immediately drew attention because it came from a longtime federal investigator with deep law enforcement credentials, not from a Democratic activist or progressive commentator. DeSarno framed his decision not as a partisan move, but as a response to what he described as a collapse of principle inside today’s Republican Party.

His harshest words were directed at Paxton first. “Ken Paxton is unfit for the United States Senate. The Texas attorney general is ethically compromised, legally entangled and openly opportunistic,” DeSarno wrote.

But the former FBI official argued that the larger disappointment was Cornyn himself — a longtime Republican senator once viewed as one of the steadier figures in Texas politics. “The harder truth is this: Sen. John Cornyn is not being challenged because he stood up to President Donald Trump. He is being challenged because he didn’t.”

A Republican Civil War Intensifies in Texas

The endorsement lands at a dangerous moment for Cornyn politically. The senator is currently trapped in a fierce Republican runoff battle against Paxton, whose aggressive MAGA support has helped him surge ahead in several recent polls. Meanwhile, President Donald Trump has notably refused to endorse either Republican, despite longstanding ties to both men.

That neutrality has only fueled tensions inside the GOP, especially as conservatives continue arguing over loyalty to Trump versus traditional Republican leadership.

At the same time, Talarico has quietly emerged as a serious Democratic contender. The former teacher and Presbyterian seminarian has built growing momentum across Texas, raising significant money and gaining attention from voters frustrated with both parties. Democrats hope he could finally break a statewide losing streak that has lasted for more than 30 years.

DeSarno’s endorsement now gives Talarico something Democrats have struggled to secure in Texas for years — validation from a former federal law enforcement figure willing to openly criticize Republican leadership.

“When the Constitution Was Tested, Cornyn Stayed Quiet”

Much of DeSarno’s criticism centered on what he views as Cornyn’s gradual transformation during the Trump era.

For years, Cornyn cultivated an image as a disciplined institutional Republican, someone who projected calm and seriousness rather than outrage-driven politics. DeSarno acknowledged that reputation directly. Cornyn once projected an image of “competence and restraint,” he wrote. “That image carried weight because people believed that when it mattered, Cornyn would act. When it mattered, he didn’t.”

The former FBI official then delivered the line that quickly spread across Texas political circles. “When the Constitution was tested, Cornyn stayed quiet. When the party drifted toward grievance and personal loyalty, Cornyn adjusted instead of confronting it. When nominees appeared before the committees he serves, who were plainly unqualified or openly partisan, Cornyn allowed the process to move forward as if norms still applied.”

The statement reflected growing frustration among some conservatives and moderates who believe senior Republicans failed to challenge Trump-aligned figures they considered extreme or unqualified.

DeSarno pointed to one example in particular: Kash Patel. According to DeSarno, he personally warned Cornyn’s office that Patel was unqualified to lead the FBI. Despite those warnings, Cornyn still supported Patel, a move DeSarno suggested was driven more by political pressure than judgment. Now, Patel himself is facing controversy, adding more weight to the criticism.

Character Over Party

DeSarno repeatedly emphasized that his endorsement was not rooted in ideology alone. Instead, he argued the race had become a test of leadership, integrity, and moral courage. “This isn’t about party. It’s about character,” he wrote.

He also framed Texas identity itself as being at stake. “Texas has never been about blind loyalty or loud grievance. At its best, Texas is about independence, accountability and the quiet expectation that a person’s word means something. It’s about standing your ground when it matters — not shifting with the moment or chasing power at any cost.”

In DeSarno’s view, Cornyn failed that standard. By contrast, he portrayed Talarico as someone willing to defend principles even when politically risky. “There is a candidate in this race who has consistently demonstrated a commitment to integrity, service and the courage to stand on principle — even when it is not politically convenient,” he wrote.

The former FBI official closed his endorsement with a direct appeal to Texas voters. “I will cast my vote based on character. And for Texans who believe our leaders should reflect the best of who we are, the clear choice is Democratic state Rep. James Talarico.”

The endorsement now adds another unpredictable layer to an already volatile Texas Senate race, where Republican infighting, Democratic momentum, and growing frustration with establishment politics are colliding all at once.