Iran said on Sunday that the ongoing conflict in Lebanon between Israel and Hezbollah will top the agenda in talks with the United States in Switzerland, as well as issues such as frozen Iranian funds and the sale of the country's oil.

U.S. President Donald Trump warned that the United States could impose tolls on the vital Strait of Hormuz waterway if negotiators are unable to complete a deal to end the war in Iran.

There will be no tolls "unless they are imposed by and for the United States of America, should the deal not be completed, for services rendered as the Guardian Angel to the countries of the Middle East for purposes of both past, present, and future reimbursement of costs," Trump posted on Truth Social.

Pakistan said technical talks to implement the U.S.-Iran deal to end the Middle East war would be held in Switzerland on Sunday.

Iran said it was once again closing the vital Strait of Hormuz shipping lane on Saturday over Israel's attacks in Lebanon, calling them a violation of its deal with the United States to end the Middle East war.

Pakistani Interior Minister Mohsin Naqvi, who is currently visiting Iran, will convey messages to Tehran regarding the nuclear negotiations, specifically relating to the thorny issue of Lebanon, sources told Al-Arabiya television.

Pakistan's interior minister arrived in Iran on Saturday after planned talks between Iran and the United States in Switzerland were postponed, Iranian media reported.

Mediators in the U.S.-Iran conflict, including Pakistan, Saudi Arabia and Turkey, are due to gather for talks in Egypt on Sunday, Cairo and Islamabad said.

The American push to quickly begin high-stakes talks with Iran hit a snag Friday, just days after the signing of an agreement that opens a two-month window for negotiations on Tehran's nuclear program and returning oil traffic through the Strait of Hormuz to prewar levels.

Iranian officials did not travel as planned to Switzerland, insisting that Israel strikes on Iranian-backed Hezbollah militants Lebanon must stop before the talks can take place, according to three regional officials and a person familiar with the matter. They were not authorized to publicly discuss the ongoing mediation to try to get the talks rescheduled and spoke on condition of anonymity.

Israel's military said Friday its forces struck targets throughout southern and eastern Lebanon overnight into Friday as Hezbollah reported intense fighting in the area, threatening the nascent agreement between Iran and the United States to end their war.

Talks planned for Friday in Switzerland between Iran and the United States, which Vice President JD Vance had been scheduled to attend, found themselves postponed as the fighting intensified. Mediators worked to reschedule the meetings crucial for starting talks over a permanent end to the Iran war, with much of the attention focused on Lebanon, regional officials said.

Switzerland announced Friday that planned talks on implementing a U.S.-Iran memorandum of understanding to end the Middle East war had been postponed, hours after U.S. Vice President JD Vance's departure for the Alpine country was cancelled.

"The planned talks between the U.S., Iran, Qatar and Pakistan have been postponed," the Swiss foreign ministry said in a message to AFP.