Joe Biden speaks during a rally. File

President Joe Biden warned Prime Minister Benjamin Netanyahu on Thursday that US 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 deaths of the employees of the US-based World Central Kitchen group on Monday, Biden also called for an "immediate ceasefire" after the "unacceptable" attack and wider humanitarian situation in Gaza.

Democrat Biden is facing growing pressure in an election year over his support for Israel's Gaza war — with allies pressing him to consider making the billions of dollars in military aid sent by the United States to its key 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."

A combo photos of the Kitchen World Charity's workers killed in Gaza.

A key Biden confidant had earlier urged him to use the leverage afforded by the huge military aid that Washington gives Israel — 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 CNN. If Israel began its long-threatened full-scale offensive in the southern city of Rafah, without plans for 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 home — 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.

'Outraged and heartbroken'

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. But 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 Post 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 Obama — the president under whom Biden served as vice president — 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 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."

Agence France-Presse