The Labour leader, in a letter to the Prime Minister, thanked her for informing him the bombing raids were taking place but re-stated his view Parliament should have been consulted. We have to make those decisions, and quite understandably, Parliament holds government to account for decisions its makes.
Downing Street yesterday betrayed its nervousness over the legal basis for the strike by publishing the advice of Government lawyers.
Last night Labour announced that they would provide free bus travel for all citizens aged under 25, should Jeremy Corbyn's party be elected to government at the next General Election - and, after unveiling the new policy at a sixth form in Derby, it's safe to say the students there were absolutely delighted by Labour's latest promise.
Corbyn is right, bombs will not save lives.
"Britain should be playing a leadership role to bring about a ceasefire in the conflict, not taking instructions from Washington and putting British military personnel in harm's way", Corbyn continued.
That view was echoed by Liberal Democrat leader Vince Cable, who insisted that Ms May should have sought the approval of MPs before following the USA into Syria.
"Riding the coat-tails of an erratic U.S. president is no substitute for a mandate from the House of Commons", he said.
"The Prime Minister could and should have recalled Parliament this week and sought the approval of MPs before proceeding".
"Liberal Democrats stood ready to assess the evidence and objectives for any action and, if it were properly planned and justified, to support a military response".
Mr Philp also said that, even if there was a vote, a number of Labour backbenchers had already expressed their willingness to side with the government and back military action.
David Cameron, May's predecessor, lost a parliamentary vote on air strikes against Assad's forces in 2013 when 30 Conservative politicians voted against action, with many Britons wary of entering another conflict after interventions in Iraq, Afghanistan and Libya failed to bring stability to the region.
"This action risks not just further escalating the civil war in Syria but also a risky escalation of worldwide tensions". "United Kingdom foreign policy should be aimed at reaching an worldwide consensus not simply complying with Presidential wishes".
Mrs May described the alleged chemical attack as a "shocking, barbaric act" and said she was "appalled but not surprised" at Russian Federation, which vetoed a US-drafted United Nations resolution proposing a new inquiry to establish who was to blame.
She said: "The speed with which we are acting is essential in co-operating with our partners to alleviate further humanitarian suffering and to maintain the vital security of our operations".
Foreign Minister Boris Johnson, however, backed May's decision.
Then came the suspected chemical attack in Douma, followed by global condemnation and threats of military action.