Asked about reporting that there is U.S. intelligence indicating that China is preparing weapons shipments to Iran during the ceasefire, Defense Secretary said China has assured the U.S. this is not the case.

"President Trump has a very strong and direct relationship with President Xi, and they've communicated on that, and China has assured us that that indeed is not going to happen," Hegseth said.

Trump and Xi are expected to meet in China in May, a trip that was delayed after the start of the U.S.-Israeli war with Iran.

Despite Iranian leadership's command and control capabilities being "highly degraded," Iran has a "high incentive" to maintain in the ceasefire, Defense Secretary Pete Hegseth said in a press conference at the Pentagon Thursday.

Chairman of the Joint Chiefs of Staff Gen. Dan Caine warned that during the ceasefire "the United States Joint Force remains postured and ready to resume major combat operations at literally a moment's notice."

Chairman of the Joint Chiefs of Staff Gen. Dan Caine described in detail on Thursday the current state of the U.S. blockade of Iranian ports, warning any ship away from trying to cross the blockade line.

"This blockade applies to all ships, regardless of nationality, heading into or from Iranian ports. The US action is a blockade of Iran's ports and coastline, not a blockade of the Strait of Hormuz," Caine said during a press conference at the Pentagon Thursday.

Enforcement of blockade will be in in territorial seas and international waters, Caine said. Speaking in front of a map of the strait, Caine said that 13 ships had "made the wise choice" of turning around instead of attempting to traverse the waterway.

Caine said the U.S. would "actively pursue any Iranian flagged vessel or any vessel attempting to provide material support to Iran."

"This includes dark fleet vessels carrying Iranian oil," he added.

U.S. Defense Secretary Pete Hegseth warned the Iranian regime that the U.S. would target "dual-use" critical infrastructure if the two sides fail to reach a deal war.

"We are reloading with more power than ever before, and better intelligence, even more importantly, better intelligence than ever before," Hegseth said. "As you expose yourself with your movement to our watchful eye, we are locked and loaded on your critical dual-use infrastructure, on your remaining power generation and on your energy industry."

"We'd rather not have to do it, but we're ready to go at the command of our president and at the push of a button. This blockade -- which the chairman will detail this morning -- is the polite way that this can go," Hegseth said.

As Tehran asserts that it will not participate in a second round of in-person talks with U.S. negotiators in Islamabad, Pakistan, on Monday unless the naval blockade on Iranian ports is lifted, President Donald Trump is claiming that a peace deal is almost complete.

"I feel fine about it. The concept of the deal is done. I think we have a very good chance to get it completed," Trump told Axios in an interview on Sunday.

The president offered no details regarding what was in the deal.

Trump's comments to Axios were published just hours after he threatened to bomb all of Iran's power plants and bridges if the Iranians don't sign the deal.

“If the deal isn’t done, the deal that we made, then I’m going to take out their bridges and their power plants," Trump told Fox News in a separate interview. “If they don’t sign this thing, the whole country is going to get blown up.”

The president told ABC News' Jonathan Karl something similar Sunday.

"It’s going to be very good," Trump said. "They are either going to do it or they are going to have problems. We’ll see what happens."

The present ceasefire agreement is set to expire on Wednesday.

-ABC News' Nicholas Kerr