Iran live updates: CENTCOM details 10th consecutive night of strikes

Lebanese President Joseph Aoun will visit the White House on Tuesday, a White House official confirmed, marking his first face-to-face meeting with President Donald Trump.

The U.S. has tried to treat Lebanon as a separate conflict from the Iran war, with Trump saying in April that the deal with Iran “is not in any way tied to Lebanon.” But Iran has made clear that Lebanon is a sticking point in any negotiation, and last month’s memorandum of understanding promised an end to military operations, including in Lebanon. Despite the MOU falling apart, Lebanon-Israel talks -- brokered by the U.S. -- were held in Rome last week, with a State Department official calling it “productive and positive discussions.”

Aoun met with Secretary of State Marco Rubio on Sunday, and the State Department announced a step forward in the implementation of the framework agreement on Monday, saying pilot zone operations had begun in three villages in Lebanon.

Aoun’s office said he will focus on trying to “consolidate the ceasefire, restore security and stability to Lebanon,” as well as the withdrawal of Israeli forces.

-ABC News' Emily Chang

President Donald Trump issued a warning to Iran on Monday following the deaths of three American servicemembers this weekend-- saying Iran "will pay" every time they kill Americans.

"Every time Iran kills an American Soldier they will pay for that killing many times over!" Trump wrote.

But the president did not elaborate on how Iran will "pay," or whether there will be consequences separate from the ongoing strikes that have hit the country the past nine consecutive nights.

Sunday night, Trump said the U.S. had struck Iran "in honor" of the fallen U.S. servicemembers.

In his post Monday, Trump added that "this directive has been passed on to Secretary of War, Pete Hegseth, Chairman of the Joint Chiefs of Staff, Daniel Caine, and every Leader in the Military"-- though it is unclear exactly what consequence to Iran is outlined in this alleged "directive."

--ABC News' Emily Chang and Michelle Stoddart

President Donald Trump will attend the dignified transfer ceremony of the fallen U.S. service members at Dover Air Force Base on Tuesday, White House press secretary Karoline Leavitt wrote on social media.

"President Trump will attend the dignified transfer of our fallen heroes tomorrow evening at Dover Air Force Base," Leavitt said.

"The President and the entire White House are praying for their families," Leavitt added.

-ABC News’ Michelle Stoddart

Secretary of State Marco Rubio told reporters that Iran is continuing to send messages "directly and through multiple channels with other countries," indicating it was willing to negotiate, and that the U.S. remains open to diplomacy -- but he noted that a "growing split" in Iran’s system complicates that.

"So, they’ll have to work out that split internally. We’re going to continue to respond," he said.

Rubio said the current military mission is solely focused on responding to Iran’s attacks in the Strait of Hormuz.

"The only reason why the U.S. is conducting strikes is against assets of Iran that are being used to attack global commercial shipping," Rubio said. "Other countries should join us in this effort, but the United States is involved not just in protecting those ships but in targeting the places that they use to launch these missiles and drones."

Rubio also spoke about the service members killed.

"The mission they carry out is very, very dangerous," he said. "Our hearts go out to the families of the heroes that paid the ultimate price."

-ABC News’ Shannon Kingston