President Donald Trump said Saturday that he was reviewing a new Iranian proposal to end the war.

"I'll let you know about it later," he said before boarding Air Force One, adding that "they're going to give me the exact wording now."

Trump later posted on Truth Social: "I will soon be reviewing the plan that Iran has just sent to us, but can’t imagine that it would be acceptable in that they have not yet paid a big enough price for what they have done to Humanity, and the World, over the last 47 years."

Two semiofficial Iranian outlets, Tasnim and Fars, believed to be close to Iran's paramilitary Revolutionary Guard, said Iran has sent a 14-point proposal via Pakistan in response to a nine-point U.S. proposal.

Trump rejected a previous Iranian proposal this week. However, conversations have continued, and the three-week ceasefire appears to be holding.

The president also has floated a new plan to reopen the Strait of Hormuz at the mouth of the Persian Gulf, where about a fifth of the world's trade in oil and natural gas typically passes.

The United States has warned shipping companies they could face sanctions for paying Iran to pass safely through the Strait of Hormuz, adding pressure in the standoff over control of it.

Iran effectively closed the strait by attacking and threatening ships after the U.S. and Israel launched a war on Feb. 28. Tehran later offered some ships safe passage via routes closer to its shore, charging fees at times.

The U.S. on Friday warned against transfers not only in cash but also in "digital assets, offsets, informal swaps, or other in-kind payments," including charitable donations and payments at Iranian embassies.

The U.S. has responded with a naval blockade of Iranian ports since April 13, depriving Tehran of oil revenue it needs to shore up its ailing economy. The U.S. Central Command on Saturday said 48 commercial ships have been told to turn back.

Iran on Saturday said it hanged two men convicted of spying for Israel.

The judiciary's news outlet, Mizanonline, said Yaghoub Karimpour was accused of sending "sensitive information" to an officer in Israel's Mossad intelligence agency, while Nasser Bekrzadeh allegedly sent details about government and religious leaders as well as information about Natanz. The city is home to a nuclear enrichment facility bombed by Israel and the U.S. last year.

Iran has hanged more than a dozen people over alleged espionage and terrorist activities in recent weeks. Rights groups say Iran routinely holds closed-door trials in which defendants are unable to challenge the accusations they face.