Is this Trump's last 'last chance'? Ceaseless string of broken ceasefires fuels doubt over Iran deal

President Donald Trump is warning Iran that it has one last chance to make a deal, even as Tehran denies the negotiations Trump says persuaded him to hold off on a major U.S. attack.

Trump said diplomacy persuaded him to call off a planned attack on Iran that he described as the biggest since World War II.

"The first phase is the opening of the straits. The second phase will be the denuclearization," Trump said in the Oval Office. "And that will take a little while."

Iranian Foreign Ministry spokesman Esmail Baghaei said, however, that Tehran was neither holding talks with the United States nor expecting an American delegation. He described the Oman discussions as a bilateral effort to establish a temporary shipping corridor through the Strait.

Trump, in response, accused Iran's leadership of being "unbelievably duplicitous."

"They ask for a meeting, some would say 'beg,' talks begin, with more scheduled in the immediate future, and they say, openly and proudly, that they're not having any discussions," Trump wrote Monday on Truth Social.

Later that afternoon, Trump called the talks Iran's "last chance" to avoid an escalation in U.S. strikes.

"There's certainly an element of posturing involved," Ali Vaez, deputy program director for the Middle East at International Crisis Group, told Fox News Digital. "While there are no 'talks' in the sense of U.S. and Iranian officials sitting at the same venue exchanging proposals and counter-offers, engagement appears ongoing."

"He'd like to be able to walk away with a win. The Iranians are not allowing him to do that," Jonathan Schanzer told Fox News Digital. "There is not a clear path ahead for him at this moment."

"Fundamentally, both sides know that the status quo is a recipe for continued military and economic attrition without a clear endgame," Vaez said.

Saudi Arabia and other Gulf allies have urged Trump to hold off on the planned attack, fearing more Iranian reprisals against their territory.