Manchin rips Cornyn for filibuster flip as Texas GOP runoff looms

Sen. John Cornyn’s reversal on scrapping the Senate filibuster is sparking backlash among some supporters of the 60-vote rule, with one leading proponent, former Sen. Joe Manchin, I-W.Va., accusing the Texas Republican of ditching his long-standing position for political expediency. 

"When I was a U.S. Senator, there was not another person more committed to keeping the filibuster than Senator John Cornyn," Manchin wrote in a scathing social media post Thursday. "He understood the incredible political pressure I faced from my former party to get rid of the filibuster and give Democrats complete power — and at the time, he understood why neither party should take our country past this point of no return."

"These extreme election-year politics that put party power over everything else are why Americans are sick and tired of the duopoly of the two-party system of Democrats and Republicans," Manchin added.

Cornyn, who is locked in a heated run-off election to win a fifth Senate term, called on Republicans in an op-ed Wednesday to consider ditching the filibuster Wednesday to pass a Trump-backed election bill. The measure, known as the (Safeguarding American Voter Eligibility) SAVE Act, is facing an uphill battle in the Senate due to expected unanimous opposition from Democrats. Under Senate rules, most legislation is subject to a 60-vote threshold to cut off debate and move on to final passage.

The editorial was a notable shift for the Texas Republican, who previously defended the merits of the filibuster.

"For many years, I believed that if the U.S. Senate scrapped the filibuster, Texas and our nation would stand to lose more than we would gain," Cornyn wrote. "But when the reality on the ground changes, leaders must take stock and adapt."

Cornyn is currently vying in a two-man race against state Attorney General Ken Paxton, R-Texas, and President Donald Trump's endorsement could prove decisive. The president has repeatedly called on Senate Republicans to abolish the 60-vote requirement or pursue a rarely tried talking filibuster and send the SAVE America Act to his desk. Paxton had previously come out in support of ending the Senate filibuster.

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Manchin, a former Democrat-turned-Independent who passed on running for re-election in 2024, alleged that Cornyn personally reached out to him after he defeated Democrats' gambit to nix the 60-vote rule under former President Joe Biden.

In early 2022, Manchin supplied the critical vote alongside former Sen. Kyrsten Sinema, I-Ariz., and Republicans to tank a Democratic-led effort to abolish the filibuster and pass so-called voting rights legislation.

"It’s deeply disappointing to see that Senator Cornyn is now willing to scrap the very rule he once praised and personally thanked me for defending," Manchin wrote.

At that time, Cornyn urged Democrats to preserve the filibuster while Republicans were serving in the minority.

"Power is fleeting and at some point the shoe will always be on the other foot," Cornyn said in a floor speech. "Liberal activists may like the idea of nuking the filibuster today, but they’ll soon find themselves ruing the day their party broke the Senate."

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Cornyn denied Manchin’s account Thursday. He has also argued that his reversal on the Senate filibuster was not aimed at winning Trump’s endorsement. 

"There's no Joe Manchins left in the Democratic Party and no Kyrsten Sinemas… this is an entirely different circumstance, dealing with Democrats who will not negotiate or consider anything that President Trump or Republicans want," the Texas Republican told reporters. "We can either accept that or we can fight back, and I think we should fight back."

Senate Majority Leader John Thune, R-S.D., who has come under significant pressure from Trump and conservative influencers to pass the SAVE America Act, indicated Wednesday that the filibuster is here to stay regardless of Cornyn’s pleas.

"Senator Cornyn is one of 53 Republican senators, and the opposition to nuking the filibuster runs very, very deep in our conference," Thune told reporters.

Manchin has continued to sing the filibuster’s praises in his retirement, arguing that the 60-vote threshold protects the minority party and forces legislation to be bipartisan.

"The filibuster — the soul of the Senate — has preserved the Senate’s role for nearly 250 years as the institution that cools passions, protects minority voices, and demands consensus," Manchin said. "America was built on institutions designed to resist political convenience, not surrender to it."

Fox News Digital reached out to Cornyn's office for comment.