Washington. US President Donald Trump vetoed a plan presented by Israel to the United States to kill Iran’s Supreme Leader Ayatollah Ali Khamenei, according to a US official familiar with the matter.

The Israelis informed the Trump administration in recent days that it had developed a credible plan to kill Khamenei. After being briefed on the plan, the White House made clear to Israeli officials that Trump was opposed to the Israelis making the move, according to the official, who was not authorized to comment on the sensitive matter and spoke on the condition of anonymity.

The Trump administration is desperate to keep Israel’s military operation aimed at decapitating Iran’s nuclear program from exploding into an even more expansive conflict and saw the plan to kill Khamenei as a move that would enflame the conflict and potentially destabilize the region.

Asked on Sunday about the plan during a Fox News interview, Sunday, Israeli Prime Minister Benjamin Netanyahu declined to comment.

“But I can tell you, I think that we do what we need to do, we’ll do what we need to do. And I think the United States knows what is good for the United States,” Netanyahu said.

Trump's rejection of the proposal was first reported by Reuters.

Trump on Sunday also issued a stark warning to Iran against retaliating on US targets in the Middle East while predicting Israel and Iran would “soon” make a deal to end their escalating conflict.

In an early morning social media posting, Trump said the United States “had nothing to do with the attack on Iran” as Israel and Iran traded missile attacks for the third straight day. Iran, however, has said that it would hold the US -- which has provided Israel with much of its deep arsenal of weaponry -- for its backing of Israel.

Israel targeted Iran’s Defense Ministry headquarters in Tehran and sites it alleged were associated with Iran’s nuclear program, while Iranian missiles evaded Israeli air defenses and slammed into buildings deep inside Israel.

“If we are attacked in any way, shape, or form by Iran, the full strength and might of the US Armed Forces will come down on you at levels never seen before,” Trump said.

Hours later, Trump took to social media again to predict “Iran and Israel should make a deal, and will make a deal."

The president said he has a track record for de-escalating conflicts, and that he would get Israel and Iran to cease hostilities “just like I got India and Pakistan to make peace" after the two countries' recent cross-border confrontation.

India struck targets inside Pakistan after militants in April massacred 26 tourists in Indian-controlled Kashmir. Pakistan has denied any links to the attackers. Following India’s strikes in Pakistan, the two sides exchanged heavy fire along their de facto borders, followed by missile and drone strikes into each other’s territories, mainly targeting military installations and airbases.

It was the most serious confrontation in decades between the countries. Trump on Sunday repeated his claim, disputed by India, that the two sides agreed to a ceasefire after he had offered to help both nations with trade if they agreed to de-escalate.

Trump also pointed to efforts by his administration during his first term to mediate disputes between Serbia and Kosovo and Egypt and Ethiopia.

“Likewise, we will have PEACE, soon, between Israel and Iran!” Trump said. “Many calls and meetings now taking place. I do a lot, and never get credit for anything, but that’s OK, the PEOPLE understand. MAKE THE MIDDLE EAST GREAT AGAIN!”

The growing conflict between Israel and Iran is testing Trump, who ran on a promise to quickly end the brutal wars in Gaza and Ukraine and build a foreign policy that more broadly favors steering clear of foreign conflicts.

Trump has struggled to find an endgame to the wars in Ukraine and Gaza.

And after criticizing President Joe Biden during last year’s campaign for preventing Israel from carrying out strikes on Iranian nuclear sites, Trump found himself making the case to the Israelis to give diplomacy a chance.