U.S. President Donald Trump said Sunday that American negotiators will travel to Pakistan for a new round of talks with Iran, which had earlier doubled down on its pledge to blockade Hormuz.

Trump made the announcement in a social media post but didn't detail which officials the U.S. would be sending to a second round of in-person talks with Iran in Islamabad.

The White House and office of U.S. Vice President JD Vance, who led the first round of talks, didn't immediately respond to messages Sunday morning.

The post also accused Iran of violating the cease-fire agreement by firing bullets Saturday in the Strait of Hormuz and threatened to destroy civilian infrastructure in Iran if it doesn't take the deal that the U.S. is offering.

Trump said he was offering Iran "a reasonable deal" and if Tehran says no "the United States is going to knock out every single Power Plant, and every single Bridge, in Iran. NO MORE MR. NICE GUY!"