US President Donald Trump Saturday cancelled a planned visit by two American envoys to Iran war mediator Pakistan, dealing a fresh setback to peace prospects after Iran's foreign minister flew out of Islamabad without any sign of a breakthrough.Trump said in a social media post that he had called off the planned trip by his special envoy Steve Witkoff and son-in-law Jared Kushner, citing what he described as confusion within the Iranian leadership."Too much time wasted on traveling, too much work! Besides which, there is tremendous infighting and confusion within their 'leadership.' Nobody knows who is in charge, including them. Also, we have all the cards, they have none! If they want to talk, all they have to do is call!!!" he wrote.Trump later told Fox News: "We have all the cards. They can call us anytime they want, but you're not going to be making any more 18-hour flights to sit around talking about nothing." Asked by Axios whether the cancellation meant a resumption of hostilities, Trump said: "No. It doesn't mean that. We haven't thought about it yet."Iranian Foreign Minister Abbas Araghchi earlier left the Pakistani capital after meeting Pakistani military chief Asim Munir, a key figure in the mediation effort, along with Prime Minister Shehbaz Sharif and Foreign Minister Ishaq Dar.Araghchi described his visit to Pakistan as "very fruitful," adding in a social media post that he had "shared Iran's position concerning (a) workable framework to permanently end the war on Iran. Have yet to see if the US is truly serious about diplomacy."Sharif said he spoke by phone with Iranian President Masoud Pezeshkian Saturday after the talks were called off and reaffirmed Pakistan's readiness to help resolve the conflict. "Pakistan remains committed to serve as an honest and sincere facilitator — working tirelessly to advance durable peace and lasting stability in the region," Sharif wrote on X.Iranian media reported that Araghchi had flown to Muscat to meet senior Omani officials. He will however, head back to Pakistan after visiting Oman, state media reported Saturday.The IRNA news agency, citing the foreign ministry, reported that Araghchi "is scheduled to visit Pakistan again after completing his trip to Oman and before travelling to Russia".Part of his delegation had returned to Tehran, it added, "to consult and obtain the necessary instructions on issues related to ending the war, and is scheduled to rejoin Araghchi in Islamabad tonight".He is also expected to travel to Russia to discuss efforts to end the war, which the United States and Israel began against Iran on February 28.Tehran has ruled out a new round of direct talks with Washington. An Iranian diplomatic source in Islamabad told Reuters: "Principally, Iranian side will not accept maximalist demands."White House press secretary Karoline Leavitt had earlier said the US had seen some progress from the Iranian side in recent days, while Vice President JD Vance was ready to travel to Pakistan. Vance led a first, unsuccessful round of talks with Iran in Islamabad earlier this month.Iran's Revolutionary Guards said Saturday they had no intention of ending their blockade of the waterway. "Controlling the Strait of Hormuz and maintaining the shadow of its deterrent effects over America and the White House's supporters in the region is the definitive strategy of Islamic Iran," they said.European Council President Antonio Costa said the strait "must immediately reopen without restrictions and without tolling. This is vital for the entire world."