A top Israeli cabinet minister is heading to Washington for talks with US officials, sparking a rebuke from Israeli prime minister Binyamin Netanyahu in a sign of widening cracks in his wartime government nearly five months into the war with Hamas.

The trip by Benny Gantz, a centrist political rival who joined Mr Netanyahu’s hard-line government in the early days of the war following Hamas’s October 7th attack on southern Israel, comes amid deep disagreements between Mr Netanyahu and US president Joe Biden over how to alleviate the suffering of Palestinians in Gaza and create a post-war vision for the enclave.

The US was prompted to airdrop aid into Gaza on Saturday after dozens of Palestinians rushing to grab food from trucks were killed last week. The airdrops circumvented what has been a prohibitive aid delivery system, which has faced Israeli restrictions, logistical issues within Gaza as well as the ongoing fighting inside the enclave.

But aid officials say the airdrops are far less effective than the aid sent in trucks.

US priorities in the region have increasingly been hampered by Mr Netanyahu’s hard-line cabinet, where ultra-nationalists dominate. Mr Gantz’s more moderate party at times acts as a counterweight to Mr Netanyahu’s far-right allies.

An official from Mr Netanyahu’s Likud party said Mr Gantz’s visit comes without authorisation from the Israeli leader. The official said Mr Netanyahu had a “tough talk” with Mr Gantz about the trip and told him the country has “just one prime minister”.

An Israeli official said Mr Gantz had informed the PM of his intention to travel to the US and to co-ordinate messaging with him. The official said the visit is meant to strengthen ties with Washington, to bolster support for Israel’s ground campaign and to push for the release of Israeli hostages held in Gaza.

Mr Gantz is set to meet with US vice-president Kamala Harris and national security adviser Jake Sullivan, according to his National Unity party.

Mr Netanyahu has tanked in popularity since the war broke out, according to most opinion polls, with many Israelis holding him responsible for Hamas’s cross-border raid that left 1,200 people, mostly civilians, dead and roughly 250 people, including women, children and older adults, abducted and taken into Gaza, according to Israeli authorities.

The subsequent fighting has killed at least 30,410 Palestinians, around two-thirds of them women and children, according to Gaza’s Health Ministry, which does not distinguish between civilians and fighters.

Around 80 per cent of the population of 2.3 million have fled their homes, and UN agencies say hundreds of thousands are on the brink of famine.

Critics say Mr Netanyahu’s decision-making has been tainted by political considerations – a charge he denies.

The criticism is particularly focused on plans for post-war Gaza. Mr Netanyahu has released a proposal that would see Israel maintain open-ended security control over the territory with local Palestinians running civilian affairs.

The US wants to see progress on the creation of a Palestinian state, envisioning a revamped Palestinian leadership running Gaza with an eye towards eventual statehood.

That vision is opposed by Mr Netanyahu and the hard-liners in his government.

Mr Gantz, who polls show would earn enough support to become prime minister if a vote were held today, is viewed as a political moderate. But he has remained vague about his view of Palestinian statehood.

A visit to the US, if met with progress on the hostage front, could further boost his support.

Israel has essentially endorsed a framework of a proposed Gaza ceasefire and hostage release deal, and it is now up to Hamas to agree to it, a senior US official said on Saturday.

Israelis, deeply traumatised by Hamas’s attack, have broadly backed the war effort as an act of self-defence, even as global opposition to the fighting has increased.

But a growing number are expressing their dismay with Mr Netanyahu. Some 10,000 people protested on Saturday to call for early elections. Such protests have grown in recent weeks, but remain much smaller than last year’s demonstrations against the government’s judicial overhaul plan.

If the political rifts grow and Mr Gantz quits the government, the floodgates will open to broader protests by a public that was already unhappy with the government when Hamas struck, said Reuven Hazan, a professor of political science at Jerusalem’s Hebrew University.

“There is a lot of anger,” he said, listing grievances that were building well before October 7th.

“The moment you have that anger and a coalition that is disconnected from the people, there will be fireworks.”

Mr Netanyahu’s government will not collapse if Mr Gantz exits, but it could lose legitimacy in the eyes of much of the public.

Talks aimed at brokering a Gaza ceasefire restarted on Sunday in Egypt. International mediators hope to broker a deal that would pause the fighting and free some of the remaining hostages before the Muslim holy month of Ramadan begins around March 10th.