Update: President Trump said Tuesday night he's agreed to a two-week ceasefire, provided Iran reopens the Strait of Hormuz. Read more here. Our earlier story is below.

President Trump said "a whole civilization will die tonight" unless a deal is reached with Iran by his Tuesday night deadline.

"I don't want that to happen, but it probably will," the president said in a post on Truth Social Tuesday morning.

Mr. Trump has given Iran until 8 p.m. ET on Tuesday to agree to a deal to reopen the Strait of Hormuz, or else he says he will order attacks to destroy all of the country's power plants and bridges. He said on Monday at the White House that "the entire country could be taken out in one night, and that night might be tomorrow night."

In his post Tuesday morning, the president also suggested that something "revolutionarily wonderful can happen," arguing that "different, smarter, and less radicalized minds" are now leading Iran.

"We will find out tonight, one of the most important moments in the long and complex history of the World," Mr. Trump said.

The deadline comes amid a renewed diplomatic push. Mr. Trump told reporters Monday that Iran had made a "significant" proposal, which he called "not good enough" but a "very significant step." He also said he believes the Iranians are negotiating "in good faith."

He called Iran an "active, willing participant" in ongoing negotiations.

A U.S. official on Tuesday morning confirmed that American forces had conducted new strikes on military targets on Iran's Kharg Island, a vital location for Iran's oil exports.

The official said that, as with similar attacks launched in mid-March, oil infrastructure was not targeted in the overnight attacks.

Democrats in Congress panned Mr. Trump's latest rhetoric, voicing concern about the possible escalation.

Senate Minority Leader Chuck Schumer called the president "an extremely sick person." He and House Minority Leader Hakeem Jeffries urged Republicans in Congress to express opposition to the war.

"It's time for every single Republican to put patriotic duty over party and stop the madness," said Jeffries, a New York Democrat.

Rank-and-file members in both the House and Senate expressed outrage after Mr. Trump's threat. Some called for impeachment and for the 25th amendment to be invoked to remove Mr. Trump from office, while others demanded that House Speaker Mike Johnson call Congress back into session immediately and said the president's threats could constitute war crimes.

GOP Sen. Ron Johnson of Wisconsin stressed on John Solomon's podcast Monday that he did not "want to see us start blowing up civilian infrastructure."

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