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US President Joe Biden warned Israeli Prime Minister Benjamin Netanyahu on Thursday that American policy on Israel depends on the protection of civilians in Gaza, in his strongest hint yet of possible conditions on military aid after an Israeli strike killed seven aid workers.

In their first call since the killing of the employees of the US-based World Central Kitchen (WCK) group on Monday, Biden also called for an "immediate ceasefire" after the "unacceptable" attack and wider humanitarian situation in Gaza.

Biden, a Democrat, is facing growing pressure in an election year over his support for Israel's war on GazaÌý– with allies pressing him to consider making the billions of dollars in military aid sent by the United States to its Middle Eastern ally each year dependent on Netanyahu listening to calls for restraint.

Biden "made clear the need for Israel to announce and implement a series of specific, concrete, and measurable steps to address civilian harm, humanitarian suffering, and the safety of aid workers", the White House said in a readout of the call.

"He made clear that US policy with respect to Gaza will be determined by our assessment of Israel's immediate action on these steps."

National Security Council spokesman John Kirby said that the United States wanted to see action within the "coming hours and days" including a "dramatic" increase in aid to Gaza, where the United States has warned of impending famine.

Kirby acknowledged that the call followed "growing frustration" with Netanyahu although he reiterated that US support for Israel's security was "ironclad".

A key Biden confidant had earlier urged him to use the leverage afforded by the huge military aid that Washington gives IsraelÌý– something Biden has resisted for the past six months.

"I think we're at that point," Chris Coons, a Democratic senator from the president's home state of Delaware, told American broadcaster CNN.

If Israel began its long-threatened full-scale offensive in the southern city of Rafah, without plans to protect some 1.5 million people sheltering there, "I would vote to condition aid to Israel", Coons said.

"I've never said that before, I've never been there before," he added.

Biden also reportedly faces pressure from even closer to homeÌý– from First Lady Jill Biden.

"Stop it, stop it now," she told the president about the growing toll of civilian casualties in Gaza, according to comments by Biden himself to a guest during a meeting with members of the Muslim community at the White House, and reported by the New York Times newspaper.

'Outraged and heartbroken'

Biden has supported Israel's six-month-old war on Gaza, but has increasingly voiced frustration with Israel's right-wing premier over the soaring death toll and dire humanitarian situation in the Palestinian enclave.

In his strongest statement since the war began, Biden said on Tuesday that he was "outraged and heartbroken" by Israel's killing of the seven aid workers, who included a US-Canadian citizen.

Israel has claimed the deaths were unintentional, but WCK founder and celebrity chef José Andrés toldÌý¸é±ð³Ü³Ù±ð°ù²õÌýtheÌýIsraeli attack that killed his workersÌýhad targeted them "systematically, car by car".

Biden's words have not been matched by any concrete steps to limit the billions of dollars in military aid that Washington supplies to its bedrock regional ally.

In a sign of business as usual, Biden's administration approved the transfer of thousands more bombs to Israel on the same day as the Israeli strikes that killed the seven aid workers, the Washington PostÌýnewspaper reported on Thursday.

Many Democrats fear the controversy could hurt Biden's chances of reelection in November against Republican Donald Trump, as Muslim and younger voters express their anger over Gaza.

A former senior aide to Barack ObamaÌý– the president under whom Biden served as vice presidentÌý– called for Biden's actions to back his words.

"The US government is still supplying 2 thousand pound bombs and ammunition to support Israel's policy," Ben Rhodes, a former deputy national security advisor in Obama's administration, wrote on social media platform X.

"Until there are substantive consequences, this outrage does nothing. Bibi [Netanyahu] obviously doesn't care what the US says, its about what the US does."

US voters are also increasingly turning against Israel's Gaza offensive.

A majority of 55 percent now disapprove of Israel's actions, compared to 36 percent who approve, according to a Gallup poll released on 27 March.

(AFP, Reuters)