A rift over the direction of US foreign policy has surfaced between Vice President JD Vance and Secretary of State Marco Rubio, as their public statements on the preliminary Iran nuclear accord and Israel’s military campaign in Lebanon diverged sharply last week. The White House and State Department have forcefully denied any split, insisting the entire administration is “100% in lockstep” behind President Donald Trump. Yet the contrasting tones and priorities of the two most senior foreign policy figures after the president have exposed a deeper ideological struggle within the Republican coalition, one that could shape the 2028 presidential race.

Vance, speaking from Switzerland where he held talks with Iranian officials, struck an optimistic note, describing the negotiations as having built a “solid foundation” for a permanent agreement. He openly criticised Israeli airstrikes on civilian infrastructure in Beirut, suggesting they undermined US-led peace efforts, and floated the idea that Gulf states could fund Iran’s post-war reconstruction. In an interview, he revealed that Washington had invited an Iranian intelligence officer to serve as a deconfliction liaison with the Pentagon in Qatar. By contrast, Rubio, touring Gulf allies, defended Israel’s operations as a justified response to Hezbollah attacks and declined to endorse the reconstruction funding proposal, calling it “far down the road.” He stressed that any final deal must be “ironclad” and that the US does not want “a deal at any price.”

The divergence, according to analysts in Washington, reflects two competing foreign policy traditions inside the Republican Party. Vance, a vocal critic of foreign military interventions before taking office, represents a non-interventionist current sceptical of overseas entanglements. Rubio, a self-described hawk during his Senate tenure, has long advocated confrontational stances toward Iran, Russia and Cuba. A Reuters/Ipsos poll completed on Monday found that only 52 per cent of Republicans believe the current conflict has put the United States in a stronger position, underscoring the party’s internal split between neoconservative interventionists and a growing base of voters who view recent wars as costly and reckless. Both men are widely seen as potential successors to Trump in 2028, making their policy differences an early indicator of the party’s future direction.

The preliminary accord, signed on 17 June, remains fragile. Implementation hinges on resolving disputes over the Strait of Hormuz, where Iran has used its control over the vital oil passage as leverage, and on containing the parallel conflict between Israel and Hezbollah. The White House maintains that the administration’s goal is to restore Lebanese government sovereignty and prevent Iran from acquiring a nuclear weapon. Vance is expected to continue technical talks with Iranian counterparts, while Rubio will report back to Washington after his Gulf tour. No date has been set for a final agreement, and the coming weeks will test whether the administration can reconcile its internal differences to deliver a durable peace.