U.S. Vice President JD Vance speaks during a press briefing in the Brady Briefing Room of the White House in Washington, DC, June 18. AFP-Yonhap

WASHINGTON — The White House said Thursday night that Vice President JD Vance was delaying a trip to Switzerland, where he'd been set to lead a new round of negotiations with Iran over its nuclear program — raising questions about what's next for the tentative agreement to end the war.

The team led by Vance had been ready to leave but was postponing, the White House said, citing difficult logistics for negotiations. The announcement followed a report from Al-Mayadeen, a pan-Arab satellite channel that is politically allied with the Iranian-backed Lebanese militant group Hezbollah, that Iran was delaying sending its delegation to Switzerland over Israel’s ongoing military campaign in Lebanon.

Vance, who was initially personally skeptical of the U.S. going to war with Iran , has increasingly become the administration’s face of the conflict and has been outspoken in defending the deal.

Earlier Thursday, he took the relatively unusual step of appearing at the White House to defend the initial deal to extend the ceasefire 60 days and allow for more negotiating — arguing that while it offers concessions, Iran first has to comply with U.S. demands.

“As they dial up their good behavior, we can dial up the economic relief,” Vance said. “If they dial down their good behavior, we can turn it off.”

But the vice president also had said during those remarks that he was not sure of the timing of his planned to Switzerland and that talks might not begin this week. The formal postponement now makes that even less clear.

Vance staying put in Washington came after the U.S. said it had lifted its blockade, allowing oil tankers to begin freely moving through the Strait of Hormuz after months of being unable to use the critical channel. Still, the tentative agreement has drawn sharp criticism from some in the U.S. — including a few congressional Republicans — who worry Washington ceded too much to Iran with relief from sanctions and a potential $300 billion fund to help with rebuilding.

Earlier, a top Trump administration envoy told U.S. lawmakers in a private briefing that Iran will invite the U.N.’s nuclear watchdog agency to inspect its nuclear sites.

And Iranian Supreme Leader Ayatollah Mojtaba Khamenei had seemed to endorse direct negotiations for his officials.

Source: Korea Times News