British Prime Minister Theresa May summoned her Cabinet back from vacation Thursday to discuss military action against Syria over an alleged chemical weapons attack.
"The chemical weapons attack that took place on Saturday in Douma in Syria was a shocking and barbaric act", May told reporters on Wednesday.
May has not confirmed whether Britain will participate directly, but said "the continued use of chemical weapons can not go unchallenged".
"But parliament must be involved before any military action is agreed".
Over 60 percent of UK nationals believe that a parliamentary vote on whether London should join the United States in its possible military action against Syria should be held, a survey by YouGov pollster showed on Thursday.
And Johnson, who was a guest on BBC One's Question Time, said: "I have to stress that no decision has been taken as to the nature of any action".
On April 8 President Trump even resorted to calling President Assad as "Animal Assad" while blaming Russian Federation and Iran of backing Assad in conducting the chemical attacks at Syria's rebel-held town of Douma in Eastern Ghouta earlier in April which took the lives of at least 50 people including the children.
The British leader's office said Cabinet ministers "agreed on the need to take action to alleviate humanitarian distress and to deter the further use of chemical weapons by the Assad regime".
Ministers will consider the options for backing military action threatened by the United States and its allies.
The cabinet is expected to support May to join a possible military action by the USA and its allies against the Syrian regime without seeking a parliamentary approval.
Opposition Labour Party leader Jeremy Corbyn, a veteran anti-war campaigner, said Britain should press for a U.N. -led investigation rather than follow the lead of the United States. The Downing Street statement did not mention parliament, and a spokeswoman did not comment on those reports.
Britain has launched air strikes against Islamic State militants in Syria, but not against the country's government.
When asked if she would recall the British parliament, May declined to directly answer the question.