Top US diplomat Marco Rubio began a visit to Israel on Sunday, after expressing the Trump administration's unwavering support for its ally in the war with Hamas despite a strike in Qatar that drew broad criticism of Israel.

The trip is taking place after President Donald Trump rebuked Israel over the unprecedented attack against Hamas leaders meeting in Doha on Tuesday.

It marked Israel's first such strike against US ally Qatar and has put renewed strain on diplomatic efforts to bring about a truce in Gaza.

Before departing for the region on Saturday, Rubio told reporters that while Trump was "not happy" about the strike, it was "not going to change the nature of our relationship with the Israelis".

But he added that the United States and Israel were "going to have to talk about" its impact on truce efforts.

Israel's strike in Doha targeted Hamas leaders gathering to discuss a new ceasefire proposal put forward by the United States.

Netanyahu has defended the operation, saying on Saturday that killing senior Hamas officials would remove the "main obstacle" to ending the war.

In recent days, Israel has ramped up efforts to seize control of Gaza City, the territory's largest urban center, telling residents to evacuate and blowing up numerous high-rise buildings it said were being used by Hamas.

As of late August, the UN estimated that around one million people were living in the city and its surrounding areas, where it has declared a famine it blamed on Israeli aid restrictions.

Bakri Diab, who fled western Gaza City for the south, said Israeli strikes continued there as well.

"All the occupation has done is force people to crowd into places with no basic services and no safety," said the 35-year-old father of four.

- 'One obstacle' -

Gaza's civil defense agency said at least seven people were killed since dawn Sunday in Israeli strikes in the territory.

Media restrictions in Gaza and difficulties in accessing many areas mean AFP is unable to independently verify the details provided by the civil defense agency or the Israeli military.

On Friday, the UN General Assembly voted to back a revival of the two-state solution, in defiance of Israeli opposition.

Israeli allies Britain and France, alongside several other Western nations, are set to recognize Palestinian statehood at a UN gathering this month out of exasperation at Israel's conduct of the Gaza war and in the occupied West Bank.

Nevertheless, Israel retains the backing of its most powerful ally and biggest arms supplier, the United States.

Ahead of Rubio's visit, State Department spokesman Tommy Pigott said the diplomatic chief would show "our commitment to fight anti-Israel actions including unilateral recognition of a Palestinian state that rewards Hamas terrorism".

At home, opponents of the Netanyahu government have sought to pressure ministers to end the war in return for the release of Israeli hostages held in Gaza.

On Saturday, the Hostages and Missing Families Forum, the main campaign group for the captives, accused the Israeli premier of being the "one obstacle" to freeing the hostages.

Of the 251 people taken hostage by Palestinian militants in October 2023, 47 remain in Gaza, including 25 the Israeli military says are dead.

'Alarming passivity'

Brian Katulis, a senior fellow at the Middle East Institute, said Rubio was unlikely to push Israel toward a ceasefire.

"There is an alarming passivity in actually getting to a ceasefire in Gaza," said Katulis, who worked on Middle East policy under former president Bill Clinton.

"The administration seems to be listening more to its own base of Huckabees and other evangelical Christians allied with right-wing Israelis," he said, referring to the US Ambassador in Jerusalem, Mike Huckabee, a Baptist pastor.

In Jerusalem, Rubio will visit the Western Wall with Netanyahu on Sunday, according to the Israeli prime minister's office.

The war was sparked by Hamas's October 2023 attack on Israel which resulted in the deaths of 1,219 people, mostly civilians, according to an AFP tally of official figures. 

Israel's retaliatory campaign in Gaza has killed at least 64,803 people, also mostly civilians, according to figures from the health ministry in Hamas-run Gaza that the United Nations considers reliable.

by Shaun Tandon with Jay Deshmukh in Jerusalem