The UK debate comes as the European Union's foreign ministers joined together to say they understood the need for the airstrikes and called for a new push for a political solution to the war in Syria.
Parliament, which returned today after a spring break, was not consulted about the action. The British government is not legally bound to seek lawmakers' approval for military strikes, although it is customary to do so.
May's office said today that she plans to tell lawmakers that the airstrikes were "in Britain's national interest," were carried out to stop further suffering from chemical weapons attacks and had broad international support.
"We cannot allow the use of chemical weapons to become normalized, either within Syria, on the streets of the UK, or elsewhere," May plans to say, according to excerpts of her speech linking the chemical attack in Syria with the poisoning of a former Russian spy and his daughter last month with a military-grade nerve agent in the English city of Salisbury.
Foreign Secretary Boris Johnson said Monday that the airstrikes against Syria, which targeted three chemical weapons sites, had been "calibrated and proportionate." He said the action was "not an attempt to change the tide of the war in Syria or to have regime change."
In an unusual move, the British government says it will seek an emergency House of Commons debate on the airstrikes so legislators can have their say.
That after-the-fact debate which may not include a vote is unlikely to satisfy angry opposition lawmakers.
Jeremy Corbyn, leader of the main opposition Labour Party, said Britain should introduce a War Powers Act to ban military action without Parliament's approval. Corbyn said yesterday that he was not convinced the military intervention had been legal under international law.
"It looked awfully to me as though the prime minister was more interested in following Donald Trump's lead than anything else," Corbyn said.
The 28 ministers said the EU "understands" the need for the coordinated US, French and British airstrikes against Syrian regime targets last weekend following the suspected April 7 chemical attack in Douma.
They insisted it was executed with "the sole objective to prevent further use of chemical weapons and chemical substances as weapons by the Syrian regime to kill its own people." French Foreign Minister Jean-Yves Le Drian said he welcomed the unanimous backing of the military strike against Syria.
EU foreign policy chief Federica Mogherini said the EU wants to use a major meeting on Syria in Brussels next week to give impetus to UN peace moves following the airstrikes. "There is the need to give a push to the UN-led process," Mogherini said.
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