David Cameron has said the UK is committed to working with the US to "destroy" the so-called Islamic State group in Iraq and Syria.
The Prime Minister told NBC that he wanted the UK to take more action but that he would need to "take Parliament with him".
"Look, we know that we have to defeat Isil, we have to destroy this caliphate, whether it is in Iraq or in Syria," Mr Cameron said.
"That is a key part of defeating this terrorist scourge that we face.
"I want Britain to do more. I'll always have to take my parliament with me. We're talking and discussing at the moment, including with the opposition parties in Britain, what more we can do.
"Be in no doubt, we're committed to working with you [the US] to destroy the caliphate in both countries."
Muslims in Luton, from where a family of 12 left to join IS militants, have expressed scepticism about the PM's counter-extremism plan.
David Cameron has outlined a five-year plan to tackle home-grown extremism which he said "was the struggle of our generation".
The Prime Minister is setting out his five-year plan for tackling extremism which he believes leads to terrorism.