Iran live updates: Trump's 'Project Freedom' begins Monday amid attacks in strait

Iranian Foreign Ministry spokesperson Esmail Baghaei said during a Monday press conference that Tehran received a U.S. counter-proposal to end the war via mediators in Pakistan.

"The U.S. message was received through Pakistan and I will not discuss the details of the issues raised at this time, because these issues are still under review," Baghaei said.

"The issues raised about enrichment or nuclear materials are purely speculative and, at this stage, we are not talking about anything other than stopping the war completely," Baghaei said, adding, "The direction we will take in the future will be determined in the future."

-ABC News' Joe Simonetti

Maj. Gen. Ali Abdollahi, the commander of Iran's Khatam al-Anbiya Central Headquarters, said in a statement carried by state media on Monday that "any foreign armed force, especially the invading U.S. army, if they intend to approach and enter the Strait of Hormuz, will be subjected to attack."

"We will maintain the security of the Strait of Hormuz with all our might and manage it powerfully," Abdollahi said. The commander said that "all commercial ships and tankers" should "refrain from any action to transit without coordination with the armed forces stationed in the Strait of Hormuz so that their security is not endangered."

The warning came after U.S. Central Command said it would on Monday begin the "Project Freedom" operation "to restore freedom of navigation for commercial shipping through the Strait of Hormuz." President Donald Trump announced the mission on Sunday.

-ABC News' Joe Simonetti

Ebrahim Azizi, the chairman of the Iranian parliament's national security committee, warned on Sunday that the planned U.S. mission to escort commercial shipping through the Strait of Hormuz will be considered "a violation of the ceasefire" by Tehran.

"The Strait of Hormuz and the Persian Gulf will not be managed by Trump's delusional posts," Azizi said, as quoted by the semi-official Fars News Agency.

-ABC News' Will Gretsky

While exiting Air Force One in Washington, D.C., on Sunday, President Donald Trump briefly responded to a shouted question from reporters asking him how negotiations with Iran were going.

"Very well," Trump said. The president did not answer any additional questions.

-ABC News' Isabella Murray