The Prime Minister has refused to cave to demands by Jeremy Corbyn and backbench MPs to seek the backing of Parliament before launching military action against the Assad regime.
A co-ordinated airstrike attack between the UK, US and France in response to an alleged chemical weapons attack by the Syrian Government is expected over the weekend.
Speaking on the lack of a vote on the issue, Tory MP Johnny Mercer said: “We should, of course, have a debate about that with the Prime Minister and Parliament.
“Parliament is fundamentally important in this. MPs absolutely must have their say.
“But the idea that is binding and the Prime Minister then has her freedom of movement limited by it not going through Parliament I think is not good for the country and it’s not the right thing to do.”
Parliament is currently on recess and does not sit again until Monday.
Mrs May is set to launch a fierce defence of her actions to those angry at her decision when MPs return to the House of Commons.
In a defiant statement the Conservative leader is expected to outline why it was necessary to launch airstrikes.
There is a strong consensus among the Cabinet for the need for action to be taken against President Assad’s forces.
However, the Labour party front bench have condemned the Prime Minister’s refusal to give Parliament a vote on the issue and have so far refused to back military action in the region.
In a car crash interview on Radio 4’s Today programme, Diane Abbott repeatedly refused to back any form of military intervention.
The Shadow Home Secretary insisted that the UK should not engage in any bombing missions until an “independent investigation” could be conducted.
She said: “The use of chemical weapons is horrific. But first of all, we need to get the evidence.
“That’s why we’re calling for an independent, UN-led investigation of the horrific chemical weapons attacks.”
Pressed by host Nick Robinson on what evidence would satisfy Labour, Abbott said: “Let’s see what the inspectors come up with.
“The US Defence Secretary’s saying we don’t have all the evidence.
“At the moment, even in the US, there’s the understanding that we don’t have all the evidence.”
But after being repeatedly asked in what circumstances Labour would support military intervention, the only example she could offer was World War 2.
Mrs Abbott issued her call despite the fact Russia had already rejected a UN Security Council resolution to set up an independent investigation into the incident in Douma, which killed more than 65 people.
Russia has vetoed such measures six times and blocked any UN involvement in the Syrian conflict over the duration of the war.
She insisted: “Bombing is not the answer.”