The Metropolitan Police will conduct a review of the incident in Leeds involving a 28-year-old man and David Cameron in consultation with West Yorkshire Police.
The Met's Specialist Protection Command is responsible for the personal protection of the Prime Minister.
The Met confirmed that the man, who shoved Mr Cameron as he left the Civic Hall, had been arrested and later de-arrested by local officers.
David Cameron has said Britain "will not be paying €2 billion (£1.7 billion) to anyone" on December 1.
"It is British taxpayers money and it is not small change", Cameron told MPs.
Prime Minister David Cameron has told MPs the "scale and timing" of the EU's £1.7 billion bill to Britain is "unacceptable".
David Cameron said a third high-speed rail line in the north, known as HS3, was about "connectivity" not just faster journey times.
"It's recognising that if we link up the great cities of the north of England they could become a northern powerhouse to rival the dominance of London," the Prime Minister said.
He added: "It's a fundamental rebalancing, it's part of our long-term economic plan and we're only able to do it because we've got a successful, growing economy."
Tory MP Mark Pritchard has demanded a full investigation into how the Metropolitan Police security team allowed a man to get so close to the Prime Minister in Leeds today.
He called for the Met's commissioner Sir Bernard Hogan-Howe to launch an immediate internal inquiry.
The Met Police have some of the best close protection officers in the world.
However, this was a clear breach of security and could have been far more sinister in outcome.
With the terror threat level increased, this cannot be allowed to happen again.
The Met Commissioner should call an immediate and swift internal inquiry to discover why this happened and implement the necessary lessons learned as quickly as possible.
West Yorkshire Police has said that the man who 'pushed' the Prime Minister earlier today has been "de-arrested" and said the 28-year-old local man was "in the wrong place at the wrong time."
Official line: A 28-year-old local man was briefly arrested after he came close to the PM's group, who had just left the Civic Hall......
Official line cont: "No threats were made, and after the man's details were checked, he was de-arrested and allowed on his way."
ITV News has obtained footage of a man "shoving" the Prime Minister at an HS3 launch event in Leeds.
As David Cameron left Leeds Civic Hall, the man rushes up and appears push to him.
Security officers then seize the man and hurry the PM into a waiting car.
Mr Cameron was in West Yorkshire to announce proposals for a third high-speed rail line in the north, known as HS3.
The Prime Minister has been "shoved" by a protester at the HS3 launch in Leeds, according to reports.
ITV News Deputy Political Editor Chris Ship has tweeted that a journalist at the event at the Civic Hall in Leeds reported that Mr Cameron was "pushed" by a protester before police officers stepped in.
David Cameron is under fire after apparently refusing five separate requests to wear a t-shirt supporting feminism.Read the full story ›
At a campaign event in Chatham ahead of the Rochester and Strood by-election, David Cameron said the European Council will not "get my money."
The Prime Minister has stoutly refused to pay the surprise £1.7 bn surcharge handed to Britain by the EU.
These European Councils. There are too many of them and they go on far too long and they always try to get hold of your money. But they didn't get my money and I got here in the end.