ERBIL, Kurdistan Region of Iraq – Iranian parliament speaker and chief negotiator Mohammad Bagher Ghalibaf said Sunday that Israeli attacks on southern Beirut have undermined confidence in the United States' ability to honor its commitments, as Tehran and Washington move closer to signing a deal.

Israel attacked Beirut's southern suburbs earlier on Sunday, killing at least three people and wounding six others as, according to Lebanese state media.

In a post on X, Ghalibaf said the strikes had “once again shown that America either lacks the will to fulfill its commitments or the ability to do so,” warning that continued Israeli military action would complicate efforts to advance negotiations.

“By giving the green light to the regime [Israel], you cannot gain concessions. The game of bad cop and good cop is outdated. If you lack the will and ability to fulfill your commitments, speaking of continuing the path is not possible,” Ghalibaf wrote.

The complication arises as the US and Iran appear to be on the brink of signing an agreement to end the war, with US President Donald Trump on Saturday saying that the deal is “scheduled to be signed” on Sunday.

Lebanon was included in discussions surrounding the US-Iran deal, with Iranian authorities insisting that any agreement to end the conflict must include a halt to Israeli attacks on southern Lebanon.

After an exchange of fire between Iran and Israel, both sides announced a suspension of military operations, with Israel saying it would stop attacks on Iran at the request of US President Donald Trump. However, Israeli officials said operations in southern Lebanon would continue.

Earlier in June, Israel and Lebanon agreed to a “complete cessation” of hostilities and the withdrawal of Hezbollah from southern Lebanon following a US-mediated negotiating process.

The latest Israeli attacks on Beirut have complicated efforts to finalize the latest peace proposal between Iran and the US, a diplomat involved in the discussions told Fox News on Sunday.

The source told the American outlet the strikes risk undermining ongoing diplomatic efforts and increasing tensions at a sensitive stage in the negotiations, dubbing the development “a clear attempt by Israel to sabotage the President’s deal and drag the United States back into war,” according to Fox News reporter Trey Yingst.