Sir Ed, who had previously called for a temporary humanitarian ceasefire, said that “it is increasingly clear that a military solution to eliminate Hamas is not possible”.
“Liberal Democrats are urging the UK Government to call for an immediate bilateral ceasefire, as the best option to achieve a political solution,” he said.
“With a devastating humanitarian catastrophe in Gaza, an ongoing hostage situation, and growing risk of regional escalation, we must urgently demand a different approach.”
He said freezing the conflict is “unacceptable”, adding: “We are proposing a ceasefire contingent on both parties, not as an end goal but as a step towards permanent peace.”
The question of backing a ceasefire has caused rifts in the Labour party, with Sir Keir’s calls instead for “humanitarian pauses” in the fighting upsetting many.
She evaded repeated questions on how MPs would be urged to vote on the BBC’s Sunday With Laura Kuenssberg programme by refusing to “pre-empt the processes around the Speaker selecting amendments”.
Labour declined to comment on “speculation” ahead of amendments being selected.