Rubio says 'significant progress' made in Iran talks

Iranian President Masoud Pezeshkian said in a social media post on Monday that dialogue with the United States "doesn't mean surrender."

Pezeshkian's social media post came after Iran's Foreign Ministry spokesperson Esmail Baghaei announced that Iran had responded to the latest American proposal for ending the war.

"Dialogue does not mean surrender. The Islamic Republic of Iran enters into dialogue with dignity, authority, and the preservation of the nation's rights, and under no circumstances will it retreat from the legal rights of the people and the country," Pezeshkian said in his social media post. "We will serve the people with logic and with all our might, to the end, and safeguard the interests and honor of Iran."

Earlier on Monday, Baghaei said at a press briefing that Iran had sent a response to the U.S. proposal through a Pakistani mediator after reviewing the proposal "over the past several days.

“So the process continues through the Pakistani mediator," Baghaei said. "What can be said with certainty is, first of all, that rights are not something we are to negotiate or compromise over. Iran’s right to enrichment is recognized under the NPT agreement, or the Treaty on the Non-Proliferation of Nuclear Weapons. There is no need for another party to recognize this right for Iran. This right already exists."

-ABC News William Gretsky and Victoria Beaule

President Donald Trump said on social media that the U.S. will hold off on attacks on Iran, planned for Tuesday, at the request of Qatar, Saudi Arabia and the United Arab Emirates, because “serious negotiations are now taking place” and that a deal acceptable to the U.S. “will be made.”

Trump said he has asked the Pentagon to prepare for “a full, large scale assault of Iran, on a moment’s notice, in the event that an acceptable Deal is not reached.”

-ABC News' Fritz Farrow

At least 3,020 people have died in Lebanon and another 9,273 have been injured since the Iran war began, according to the Lebanese Ministry of Health.

President Donald Trump is expected to hold a meeting of his top national security advisors in the Situation Room on Tuesday, according to an administration official familiar with the plans.

The purpose of the meeting is to discuss next steps on Iran and the potential for new military action against the country, the official said.

Over the weekend, Trump met with members of his national security team at his golf club in Virginia to strategize on Iran, the official said, Vice President JD Vance, Secretary of State Marco Rubio, CIA Director John Ratcliffe and Special Envoy Steve Witkoff participated in the meeting, the official said.

-ABC News’ Shannon Kingston