US president Donald Trump has said Britain and other European allies should “take back” more than 800 Islamic State fighters captured in Syria.

Mr Trump warned the IS fighters could “permeate Europe” and called on Britain, France and Germany to “step up” and put the prisoners on trial in their countries.

He said: “The Caliphate is ready to fall. The alternative is not a good one in that we will be forced to release them.

“The US does not want to watch as these ISIS fighters permeate Europe, which is where they are expected to go.

“We do so much, and spend so much – Time for others to step up and do the job that they are so capable of doing. We are pulling back after 100% Caliphate victory!”