South Carolina Republican Sen. Lindsey Graham said Sunday that President Trump will take military control of the Strait of Hormuz if the U.S.-Iran framework agreement falls apart, escalating the administration’s rhetoric on the same morning Vice President JD Vance landed in Switzerland for talks with Iranian negotiators.

“If this deal fails, Trump is going to take the strait over by force,” Graham said on CBS’s Face the Nation. “The United States will control the strait. We will charge a fee for those who go through.”

The comments came hours after Trump floated the same idea on Truth Social, saying that if the framework collapses, the U.S. itself would impose tolls on shipping through the strait. There would be no tolls during the 60-day negotiating window, Trump said, and none after — unless the deal fell through, in which case the U.S. would charge for “services rendered as the Guardian Angel to the countries of the Middle East.”

Iran showed no signs of backing down Sunday. The Revolutionary Guard navy still had not issued permission for any vessels to transit the strait, a military source told Iran’s Fars news agency, a day after Tehran’s initial closure announcement. Foreign Ministry spokesperson Esmail Baghaei warned Saturday that “the memorandum of understanding as a whole will be jeopardized” if Israel’s strikes in Lebanon continue.

Graham also issued a direct warning to Tehran over Hezbollah, the Iran-backed militant group whose recent strikes inside Lebanon have rattled the week-old ceasefire.

“To the Iranians, if you are listening, when you use Hezbollah to attack Israel, the new policy will be, we will attack Iran,” Graham said.

National security adviser Mike Waltz, appearing on the same network, said Iran’s stockpile of highly enriched uranium — long a sticking point — has been “shipped to Russia,” a disclosure that, if confirmed by the administration, would represent one of the most concrete steps yet taken under the framework signed last week.

“We’re going to keep their nuclear program destroyed and have it permanently destroyed, as opposed to the past where it was ongoing and we were basically bribing them to not continue,” Waltz said. “It’s a totally different negotiation dynamic.”

Iranian President Masoud Pezeshkian, in a Sunday address to a banking conference in Tehran, said Iran would “never back down” from its right to enrich uranium, complicating the technical talks getting underway in Switzerland.

The Strait of Hormuz is a narrow waterway between Iran and Oman that connects the Persian Gulf to the Arabian Sea, serving as the only sea route for oil tankers leaving the Gulf. Roughly 20% of the world’s oil and liquefied natural gas passes through it each day, making any disruption to traffic an immediate shock to global energy markets.

The U.S. and Iran signed a framework agreement on June 17 at the Palace of Versailles, ending nearly four months of war. The deal lifted the U.S. naval blockade and reopened the waterway but began fraying within days as Israel and the Iran-backed militant group Hezbollah exchanged fire across the Lebanese border — prompting Iran to announce Saturday that it was re-closing the strait.

Vance arrived in Switzerland on Sunday morning, joining special envoy Steve Witkoff and Jared Kushner at a mountainside resort near Lake Lucerne. Mediators from Pakistan and Qatar were also at the table. Speaking before the session, Vance struck an optimistic tone: “The question before us now is how much more can we accomplish together? Can we turn over a new leaf?”