President Donald Trump on Saturday said in a Truth Social post that a deal to end the war with Iran will be signed on Sunday, with the Strait of Hormuz opening up immediately after.

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“The Deal is scheduled to get signed tomorrow, and immediately after it is signed, the Hormuz Strait is OPEN TO ALL,” the president wrote.

Trump suggested that the U.S. will work with Iran to remove enriched uranium from the country at an undetermined date.

“At the appropriate time, when all is calm, we will go in and get the Nuclear Dust, buried deep under the powerful sunken granite mountains,” he said.

“We look forward to working with Iran, and the entire Middle East, long into the future,” he added.

Trump’s post concluded with what appeared to be a veiled threat against Iran if its leaders don’t comply with U.S. demands.

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“Hopefully, this process will all work out quickly, easily, and smoothly. If it doesn’t, we have the ultimate alternative, hopefully never to be used again!”

The White House did not immediately respond to a CNBC request for clarification on Trump’s remarks.

Earlier on Saturday, Pakistani Prime Minister Shehbaz Sharif said the U.S. and Iran are “closer to a peace deal than ever before,” indicating a finalization in the next 24 hours with “technical level talks next week.” Trump reposted those comments on his Truth Social account.

Still, Iranian state media reported that Foreign Ministry spokesperson Esmaeil Baghaei remained cautious about the deal’s timing. A senior Trump administration official said Friday that the U.S. is not “100%” confident that the agreement they reached will be signed.

In its current state, the agreement would guarantee “long-term peace in the region” and reward Iran with “significant” economic relief.

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— CNBC’s Kevin Breuninger and Azhar Sukri contributed to this report.