Live updates: Iran walks away from talks, Tasnim says

Secretary of State Marco Rubio spoke with Lebanese President Joseph Aoun and Israeli Prime Minister Benjamin Netanyahu regarding ongoing negotiations between the two countries, a U.S. official told ABC News, and as Israel expanded its offensive against the Iran-backed Hezbollah militia in southern Lebanon.

The U.S., the official said, proposed that Israel would refrain from escalation in the Lebanese capital Beirut in exchange for Hezbollah's halt of all attacks on Israel. That step, the official said, "would create space for gradual de-escalation and an effective cessation of hostilities."

Aoun "tried to advance this proposal and secure an agreement," the U.S. official said, but was stymied by Lebanese Parliament Speaker Nabih Berri -- the head of the Shiite Amal Movement and a longtime political ally of Hezbollah.

The official described Berri's response as "evasive and disappointing," and "placed the burden on Israel to stop shooting first."

"Hezbollah is following Tehran's lead. It clearly has no interest in the welfare of the Lebanese people. Iran wants to prolong the conflict in Lebanon so it can claim credit for 'saving the day,'" the U.S. official said.

"The United States does not expect Israel to absorb ongoing attacks on its civilians by a terrorist organization. The fastest way to de-escalate and protect civilians on all sides is for Hezbollah to stop firing immediately," the official added.

The Islamic Revolutionary Guard Corps said on Monday that it launched a retaliatory attack on an unnamed air base following U.S. strikes on the Iranian island of Sirik in the Hormozgan region, which sits along the Strait of Hormuz.

"Following the aggression of the U.S. military against a telecommunications tower on Sirik Island, located in Hormozgan Province, an hour ago, IRGC Aerospace Force fighters targeted the air base from which the aggression originated, and the predicted targets were destroyed," the IRGC said in a statement carried by the semi-official Fars News Agency.

"If the aggression is repeated, the response will be completely different, and the responsibility lies with the aggressor and child-killing American regime," the IRGC said.

After meeting with his team in the Situation Room for about two hours on Friday to make a "final determination" about a deal with Iran, President Donald Trump has yet to announce a decision.

Following the meeting, a White House official said in a statement, "President Trump will only make a deal that is good for America and satisfies his redlines. Iran can never possess a nuclear weapon."

It is not clear why the president still has not announced a decision.

-ABC News' Mary Bruce and Michelle Stoddart

The U.S. Treasury Department has sanctioned the Persian Gulf Strait Authority - the entity created by Iran to manage and charge for passage through Strait of Hormuz.

Prior to this move, the Treasury Department had already warned that providing payment to the PGSA for passage through the strait could open the payer up to sanctions risks, and that firms that facilitate financing could be subject to secondary sanctions. The move to formalize the sanctions is a potential sign the administration could seek to step up enforcement of the penalties.