Trump signed the deal on Wednesday, a White House official said.
President Donald Trump announced "major combat operations" against Iran on Feb. 28, with massive joint U.S.-Israeli strikes targeting military, government and infrastructure sites.
Following the announcement of a two-week ceasefire, initial U.S.-Iran talks in Pakistan in April failed to reach a peace deal. Trump later announced the open-ended extension of the ceasefire and the continuation of a U.S. blockade until negotiations concluded.
On Sunday, Trump announced that the U.S. and Iran had reached a "great deal." The memorandum of understanding was read to reporters on Wednesday, and the U.S. and Iranian presidents signed it that day, a White House official said.
Officials from the U.S. and Iran are expected to meet on Friday in Switzerland, where they'll be joined by officials from mediating countries Pakistan and Qatar, "for initial negotiations on the implementation of the agreement," the Swiss foreign ministry said in a statement.
The meeting is expected to take place in Bürgenstock, a resort area near Lucerne, the ministry said.
-ABC News' Victoria Beaule
Israeli forces will remain in what Israel refers to as the "security zone" in southern Lebanon, an IDF official said. Further, the IDF will "continue to remove threats" even if they are "beyond the security zone."
The IDF official said that "further steps are still being discussed within the framework of direct negotiations between Israel and Lebanon. The representatives will reconvene next week."
-ABC News' Jordana Miller and Victoria Beaule
Iranian President Masoud Pezeshkian posted images on Thursday of the signed memorandum of understanding between Iran and the United States, calling it a "historical document" with this message: "Peace will be realized in the shadow of mutual respect."
The images posted by Pezeshkian on social media appeared to show his signature on the document alongside those President Donald Trump and Pakistani Prime Minister Shehbaz Sharif.
Trump signed the document while dining at Versailles on Wednesday evening, according to the White House.
-ABC News' Othon Leyva
President Donald Trump, who arrived early on Thursday back in Washington after attending the G7 and visiting Versailles, posted on social media shortly afterward on a range of topics, including his deal with Iran.
"These fools, who think I haven’t been tough enough on Iran, when the Stock Market Just Hit A RECORD HIGH, and Oil prices are 'tumbling' down, are either jealous, bad people, or stupid," Trump posted at 4:42 a.m. ET., adding, "MAKE AMERICA GREAT AGAIN!!! President DJT."
Trump's post, which followed his 3:30 a.m. ET arrival at Joint Base Andrews in Maryland, came after strong words from some members of his own party, including Sen. Bill Cassidy of Louisiana, who called the war with Iran "the worst foreign policy blunder in decades."
Sen. Chuck Schumer of New York also called on Wednesday for the president to be transparent about the deal's terms and saying, "We’ve been told dozens of times that this war is over, and dozens of times we’ve been disappointed."
"This will be regarded as one of the biggest American disasters, and it's because Trump started this war," Schumer told reporters outside the Capitol. "He didn't know how to finish it, and it looks like in too many ways he has just capitulated to the Iranians."
-ABC News' Molly Nagle and Lalee Ibssa
