A human rights group said the death toll was essential for "history" – and for "accountability".
"This war has to end with the end of Hamas," Eylon Levy told the BBC.
Dozens of his MPs backed calls for a ceasefire and 10 frontbenchers quit their jobs.
"The fear of giving birth during this war haunts my every waking moment. What if I can’t reach a hospital when the time comes?"
The result came despite a major rebellion by Labour MPs who back an immediate end to the conflict.
The move is designed to head off a rebellion by shadow ministers who back a ceasefire in the conflict.
The Israeli prime minister also called the UN's accusation of war crimes "hogwash," despite now killing more than 11,000 Palestinians in Gaza.
The levelling up secretary was targeted by protesters during Saturday's demonstration.
The president’s comments come as some Democrats are demanding an end to Israel’s assault on the enclave, which has killed thousands of civilians.