A ministerial aide in Britan, Paul Bristow, has been sacked from his government role after calling for a ceasefire in Gaza, the BBC reported on Monday.
Downing Street said Bristow had made comments which "were not consistent with the principles of collective responsibility".
In a letter to Prime Minister Rishi Sunak last week, Bristow had said "a permanent ceasefire" would save lives and allow aid to reach those who needed it most.
The government supports "humanitarian pauses" but not a full ceasefire.
During Prime Minister's Questions last week, Sunak said "specific pauses" would allow more aid into Gaza but he rejected calls to back a ceasefire, stressing that Israel had a right to defend itself.
Bristow, who is the Conservative MP for Peterborough, was a Parliamentary Private Secretary - the lowest rung of the ministerial ladder - to Michelle Donelan, the Secretary of State for Science, Innovation and Technology.
"I completely understand the PM's decision. And it is with regret I leave a job I enjoyed. "But I can now talk openly about an issue so many of my constituents care deeply about,” he told the BBC after the firing.
"I believe I can do this better from the backbenches rather than as part of the government payroll," he added.
Sunak visited Israel earlier this month in a show of solidarity following the Hamas massacre of October 7.
During the visit, Sunak met Prime Minister Benjamin Netanyahu and said, "We absolutely support Israel's right to defend itself, to go after Hamas, and to return its hostages."
"In direct contrast to Hamas, Israel is doing everything possible to avoid harming civilians. We thank you for that, and are increasing our aid to the region," he added, noting that "the Palestinian people are also victims of Hamas."
British Defense Secretary Grant Shapps told Sky News last week that asking Israel to reach a ceasefire with Hamas is "untenable", adding Israel has "a right" to "go after" Hamas after its terrorists killed more than 1,400 on October 7 and abducted over 220 others.