The threat by Mrs May comes after British spies linked two Syrian generals to the attack in April, reports the Sun.

A Government source claims they are ‘99.9 per cent’ sure Assad was responsible for the horrific chemical assault on his own people.

If the Conservatives win with a landslide victory in the upcoming General Election, the issue will be discussed in the House of Commons.

A Whitehall source, told the Sun: ‘After the election, we will have a clear majority and we will push it through.’