A major Republican donor who poured more than $100 million into the last election has broken with Vice President JD Vance and is now backing Secretary of State Marco Rubio for the 2028 presidential race, delivering a significant setback to Vance’s White House ambitions.
Ken Griffin revealed his intentions during the annual Allen & Company conference in Sun Valley, Idaho, telling financial journalist Andrew Ross Sorkin he was “predisposed” to support Rubio, whom he backed in the 2016 GOP primary. The decision comes as Vance has experienced a string of high-profile embarrassments, including troubled negotiations for peace with Iran that he helmed and fumbled initially.
Republican insiders have spoken of a “shadow” effort to get Rubio elected since early this year. The secretary of state has been enjoying favorable press while Vance was getting hammered by bad headlines.
The President’s Reported Choice
The donor split emerges against the backdrop of earlier White House chatter suggesting President Donald Trump had effectively settled on Vance as his preferred successor. Anonymous sources told Axios on July 6, 2026, that Trump was choosing the vice president over Rubio in the informal competition to inherit the MAGA mantle ahead of 2028.
One White House insider said, “POTUS isn’t asking, ‘JD or Marco?’ anymore,” and that Trump has shifted to telling people in his orbit, “JD looks great, right?” The claim followed months of Trump publicly dangling the prospect of a Vance-versus-Rubio showdown.
Yet Trump has dodged direct queries on the subject for months. As recently as June 3, he told the New York Post that Vance and Rubio are “both great” and that there is “a long time left” before 2028 becomes a live question. Some political analysts have suggested he has strong incentives to keep the race open; a definitively anointed heir could, in theory, begin to overshadow Trump within his own administration.
Vance’s Aggressive Profile
The reported behind-the-scenes endorsement arrived as Vance assembled an unusually aggressive public profile for a sitting vice president. In June 2026, he published a new memoir, “Communion: Finding My Way Back to Faith,” while simultaneously raising roughly $70 million for the Republican National Committee.
Over that same stretch, Vance sat down for more than 30 interviews and is now scheduled for a book tour spanning the next several weeks. On June 26, reporting surfaced that Vance had pulled in $4.2 million at a single dinner in Silicon Valley — a figure explicitly tied by sources to an anticipated 2028 presidential run. For a vice president still nearly two years from a potential campaign launch, the pace of activity has been striking.
Vance also received a foreign-policy boost in June when he, along with Special Envoy Steve Witkoff and presidential son-in-law Jared Kushner, helped broker a tentative framework aimed at ending the U.S. conflict with Iran. Supporters inside the administration have pointed to the deal as evidence that Vance is ready to operate on the world stage. Critics, however, note that the agreement amounts to a provisional accord rather than a binding ceasefire, and that an earlier round of Iran talks that Vance joined collapsed without result.
Rubio’s Strategic Position
Even those in Rubio’s corner appear to concede that the secretary of state is at a structural disadvantage. One White House source told Axios, “JD is earning it, and Trump sees it,” while a separate insider acknowledged that Rubio “wasn’t planning to run anyway, and he’d be even less likely to do so now.”
Rubio himself has repeatedly denied any personal ambition for the Oval Office and has said publicly that he would support Vance if the vice president enters the race. The BBC’s “Americast” program examined the Vance-versus-Rubio dynamic in an episode published May 11, noting that Trump had been asking advisors whether they preferred “JD or Marco.”
Hosts Justin Webb and Anthony Zurcher weighed the respective strengths of each figure: Vance carries greater name recognition nationally, while Rubio could potentially draw Latino voters whose support proved instrumental in securing Trump’s 2024 victory. A viral video involving Rubio, which surfaced in the weeks before the BBC episode aired, had already rekindled public speculation about the party’s 2028 direction — underscoring how closely political observers have been watching both men.
Vulnerabilities and Political Headwinds
The vice president is not without vulnerabilities. Trump has grown irritated with commentator Tucker Carlson, a prominent MAGA voice who has turned sharply critical of the administration over its Middle East policy — a tension that could complicate Vance’s relationship with one wing of the conservative media ecosystem. Pro-Israel conservatives have also expressed frustration over Vance’s role in the Iran negotiations and remarks he made that were seen as critical of Israel’s hard-right political factions.
Reporting in February made precisely that argument, though it was accompanied by quotes from five separate sources cautioning against interpreting Trump’s hesitation as any sign of diminished enthusiasm for Vance. The pattern — anonymous endorsements of Vance paired with public presidential silence — has now repeated itself several times.
Meanwhile, Democrats are facing their own structural headaches ahead of the November midterm elections. The party suffered setbacks in two separate federal court cases — one in Virginia and one in Louisiana — within 10 days, delivering what analysts described as a significant blow to Democratic hopes of recapturing Congress.
Whether Trump’s preference hardens into an official blessing remains to be seen. For now, the whisper campaign appears more complicated than earlier reports suggested, with influential Republican money flowing toward Rubio even as White House insiders signal support for Vance.