Pennsylvania's Republican Party chairman says the question of whether Democratic Sen. John Fetterman will switch parties hangs over the entire 2028 U.S. Senate primary, and he's not the only one watching. As GOP hopefuls begin jockeying for position, state Sen. Greg Rothman told The Center Square on Saturday that the uncertainty around Fetterman has frozen parts of the Republican field in place.
"We're still trying to wrestle with what happens if John Fetterman switched party and becomes a Republican," Rothman said. Asked whether a switch was a real possibility, the chairman offered a two-word answer: "I don't know."
That candid admission captures a political reality that neither party in Pennsylvania can ignore. Fetterman has spent the better part of two years drifting away from his caucus on a string of high-profile issues, Israel, border security, government funding, and executive nominations, while insisting he remains a "committed Democrat." The gap between what he says and how he votes has left Republicans intrigued, Democrats furious, and strategists on both sides scrambling to plan around a man who refuses to be pinned down.
Rothman, who doubles as a state senator, framed the Fetterman question in blunt, numerical terms. He told The Center Square that the junior senator from Pennsylvania agrees with Republicans on roughly a fifth of the issues, but those issues carry outsized weight right now.
"Look, there are 20% of the issues that he's with us on. They're pretty big issues right, immigration and the war in Iran and our ally Israel, but there's 80% of the issues that I don't think our party will agree with him on."
Then Rothman invoked a familiar standard. "I believe in the sort of the Ronald Reagan idea that if you're 20% with me, you're 100% my friend, and the things that matter right now, John Fetterman is with us," he said, adding that Fetterman "supported most of President Trump's nominees, which is a big deal."
That nominee support is no small thing. Fetterman cast what Fox News described as the deciding vote to advance Markwayne Mullin's nomination as DHS secretary out of committee. Mullin was later confirmed. Fetterman told Lara Trump at the time: "I believe in a very secure border." He added: "We also agreed that we should deport all of the criminals."
Those are not the words of a senator trying to keep his progressive base happy. They are the words of a man who has broken with his party on a government shutdown vote and dared them to do something about it.
The backlash inside Fetterman's own party has been building for months. Several Pennsylvania Democrats are already being discussed as potential 2028 primary challengers, including Philadelphia U.S. Rep. Brendan Boyle, western Pennsylvania Rep. Chris Deluzio, former Lehigh Valley Rep. Susan Wild, and former Pittsburgh-area Rep. Conor Lamb.
Boyle has not been subtle about his frustrations. The Newsmax report on the growing Democratic effort to oust Fetterman noted that Boyle called him "Trump's favorite Democrat." Fetterman, for his part, texted Axios a breezy dismissal when asked about the primary chatter: "Enjoy your clickbait!"
Lamb, who lost to Fetterman in the 2022 Democratic primary, recently told PennLive he is focused on helping Democrats win back the House this year. But the Washington Times reported that Lamb has publicly questioned Fetterman's judgment, saying: "He doesn't emphasize those things anymore and aligns with people who oppose them."
That frustration runs deep among the progressive activists who powered Fetterman's 2022 campaign. Many viewed him as a Bernie Sanders-style populist. What they got instead is a senator who regularly appears on Fox News to admonish his own party and who most recently accused Democrats of being in the grip of "Trump Derangement Syndrome."
The numbers confirm the political realignment happening around Fetterman in real time. A Quinnipiac poll cited by the Washington Times showed his approval has inverted since January: Democrats now disapprove of him 62% to 21%, while Republicans approve 54% to 33%. He has, in effect, traded one base for another.
Yet National Review noted that the overall damage among Democrats may be smaller than the loudest critics suggest. Commentator Jim Geraghty pointed to a Quinnipiac survey showing only a two- or three-point drop in Fetterman's support among Democrats, leading him to observe: "Judging by these poll numbers, the vast majority of Democrats either haven't noticed or are supportive of his position."
The broader statewide picture still favors Fetterman. Newsmax reported that he remains broadly popular in Pennsylvania, with overall approval still positive. That creates a peculiar dynamic: a senator hated by his party's activist class but liked by the state at large.
Fetterman has rejected suggestions that he might leave the Democratic Party for the GOP. He frequently refers to himself as a "committed Democrat." But his actions tell a more complicated story.
He visited President Donald Trump in Florida shortly after the 2024 election. He backed several Trump nominees. He supported the administration's immigration policies. He has been one of only two Democrats consistently backing a stopgap spending bill. He appeared on Fox News after voting with Republicans to end a government shutdown and said Democrats had "crossed a line," calling it "country over party."
His support for Israel has been particularly visible. Geraghty noted on the National Review podcast that Fetterman put up posters of Israeli hostages outside his Senate chamber, a gesture that drew sharp contrast with other Democrats. Geraghty also took a shot at Fetterman's 2022 opponent, Dr. Oz, saying: "During the campaign, Dr. Oz says that he was a strong and true and loyal friend of Israel, and he hasn't said jack squat since October 7." Fetterman, by contrast, has been publicly combative with progressives like Alexandria Ocasio-Cortez over the issue.
At the same time, Fetterman has drawn lines against the Republican agenda. He opposed Trump's signature One, Big, Beautiful Bill and the SAVE America Act. He opposed a government shutdown aimed at forcing the GOP to negotiate on Homeland Security and ICE funding and reforms. Those positions complicate any clean narrative of a full party switch.
When pressed on his political identity, Fetterman has leaned into the maverick framing. The New York Post reported that he said: "I really believe in calling balls and strikes, and I want to follow the truth." He also acknowledged the cost: "Parts of my base are really angry with me."
His hawkish stance on Iran has only widened the rift. Fetterman has signaled support for Trump's approach to Iran in terms that would be unremarkable from a Republican senator but are extraordinary from a Democrat elected with progressive backing.
Rothman said he has already had discussions with Republicans interested in running for the Pennsylvania Senate seat in 2028. He specifically mentioned wanting Jared Isaacman, the billionaire businessman, Pennsylvania resident, and current NASA Administrator, or "someone like him" to run.
But the Fetterman variable makes planning difficult. If Fetterman switches parties, the Republican primary becomes a very different race. If he stays a Democrat and faces a bruising primary from his left, the general election calculus shifts again. And if he somehow survives both his party's wrath and his own contradictions, Republicans would face an incumbent with crossover appeal in a purple state.
Rothman has not spoken with Fetterman directly about switching parties. The chairman's public posture is one of cautious openness, willing to welcome Fetterman under the Reagan tent, but clear-eyed about the 80 percent of issues where they disagree.
Fetterman's break with Democrats on voter ID legislation, where he rejected Chuck Schumer's "Jim Crow 2.0" framing, is the kind of move that keeps the speculation alive. Each new defection from progressive orthodoxy adds another data point to a pattern that both parties are trying to read.
The open questions are significant. Which specific Trump nominees did Fetterman back, and on which did he break? What would a party switch actually look like in terms of committee assignments and seniority? And does Fetterman himself even know what he wants to be when 2028 arrives?
What is clear is that Fetterman has managed to make himself the most consequential figure in Pennsylvania politics without holding a leadership post, chairing a committee, or passing a landmark bill. He has done it by saying things his party doesn't want to hear and voting in ways his base didn't expect.
Whether that makes him a man of principle or a man without a party may depend on which side of the aisle you're sitting on. But in Harrisburg and Washington alike, nobody is looking away.