Mr Cameron's government also wants to extend British air strikes against the Islamic State into Syria - currently the UK is only engaged in military operation inside Iraq.
But political reporter Theo Usherwood says the Conservative Prime Minister doesn't want to put it to a parliamentary vote until he is sure he would win.
IN: "He needs…
OUT: …that vote."
DUR: 24 seconds
http://www.fsnradionews.com/feeds/0907syria-usherwood1.mp3