Foreign secretary Boris Johnson has said it would be "very difficult to say no" if the US asked the UK to join it in military action against Bashar al-Assad's regime in Syria.
Johnson has said MPs would not necessarily vote on any action against the Assad regime. His comments come after the US undertook a missile attack on Syria following a chemical attack that killed 80 people.
Speaking on the BBC's Today Programme, Johnson said: "I think it would be very difficult if the US has a proposal to have some sort of action in response to a chemical weapons attack."
"And if they come to us and ask for our support - whether it's with submarine-based cruise missiles in the Mediterranean... in my view - and I know it's also the view of the prime minister - it would be difficult to say 'no'."
In a busy morning of interviews, the foreign secretary also said the UK would try to dissuade US President Donald Trump from launching a military strike on North Korea.
"We don't think a military strike is likely to be succesful," Johnson said on BBC Breakfast.