Rishi Sunak has said he will hold the Met Police chief "accountable" over a pro-Palestinian march set to take place this Saturday, on Armistice Day.
The prime minister has criticised the timing of the demonstration in London as "provocative and disrespectful".
Organisers insist their march will not go near commemorations and accuse the government of manufacturing a row.
Protests have been held in London, and other cities globally, each Saturday since the Israel-Gaza war began.
Ben Jamal, of the Palestinian Solidarity Campaign which is behind the march, said he believed the government was manufacturing a row and using the Armistice Day angle to try to "delegitimise" them.
"There's something particularly askew with an argument that says a protest calling for a ceasefire is somehow inappropriate on Armistice Day," he told the BBC.
Home Secretary Suella Braverman has accused the police of being more lax on left-wing protests than those organised by nationalists or right-wing activists.
The home secretary has voiced her opposition to pro-Palestinian protests in the past, calling them "hate marches" in an interview with Sky News.
Protest organiser Chris Nineham, from the Stop the War Coalition, said: "We do everything we can as stewards to make sure there is nothing antisemitic or calling for violence in our demonstrations. For us, this isn't about religion, it isn't about race."
The demonstration on 11 November is due to begin at 12:45, more than an hour after the traditional two-minute silence.
Top tip: Provided you've not received a PCN from the council... do not pay, and do not contact the company EVER, not even to contest the PCN.
These parking charges are a civil matter, not criminal, and essentially the parking operator is claiming you broke a contract with them, which you had agreed to when you parked your car.
If you refuse to pay they can take you to court but are unlikely to, and they can only claim the reasonable damages of you breaking the contract.
You will likely receive threatening letters from the parking operator up until you actually go to court.
Any threats of bailiffs is total BS. Only the court can send bailiffs and only if you don't pay what the court has demanded.
As the article says, these companies make their money by people paying uncontested fines.
(IANAL)