Trump said he has ordered "precision strikes" against Syria, where dozens of people were killed last weekend in a suspected toxic gas attack on Douma, the largest town in a former rebel stronghold outside Damascus.
Britain's defence ministry said in a statement that four British Tornado jets had fired Storm Shadow missiles at the Syrian base 15 miles (24 kilometres) west of Homs at 0100 GMT.
"The government should do whatever possible to push Russian Federation and the United States to agree to an independent UN-led investigation of last weekend's horrific chemical weapons attack so that those responsible can be held to account", he added. "We are prepared to sustain this response until the Syrian regime stops its use of prohibited chemical agents", he said. The French military on Saturday targeted Syria's main chemicals research centre as well as two other facilities, hours after President Emmanuel Macron ordered a military intervention in Syria alongside the United States and Britain in an attack on the chemical weapons arsenal.
But she will be grilled over why she broke with a convention to seek parliamentary approval for the action, a decision that she and her ministers say was driven by the need to act quickly.
Britain has said there are no plans for future strikes against Syria, but foreign minister Boris Johnson warned President Bashar al-Assad that all options would be considered if chemical weapons were used against Syrians again.
"I have done so because I judge this action to be in Britain's national interest", she added.
Britain has blamed Russian Federation for the poisoning - a charge vehemently denied by Moscow which has accused London of failing to come up with evidence for its claims.
"America does not seek an indefinite presence in Syria", he said, thanking the United Kingdom and France for joining the U.S. in its fight against the Syrian regime.
For his part, the leader of the UK Independence Party (UKIP), Gerard Batten, opposed the British military action in Syria.
May held an emergency cabinet meeting to discuss possible action on Thursday and there had been calls for the British parliament to be consulted before any air strikes. Some 36 percent were in favour of the military action. "It is not about regime change", May said in statement made from her country residence at Chequers just minutes after U.S. President Donald Trump announced the strikes from the White House.
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