Deputy Prime Minister Nick Clegg said he would rather take advice from the police and security services instead of Boris Johnson when it comes to dealing with Islamic State militants.
Speaking to ITV News on a trip to India he said that stopping militants causing harm in the UK was the "number one priority," in response to claims from the London mayor in the Daily Telegraph, that "tide or terror" could arrive in Britain unless action is taken against Islamic State (IS).
He said: "It is what the police, the authorities and the security services are working flat out on and I have huge confidence in the outstanding work that they do. With the greatest respect to Boris Johnson I will listen to what they tell me they need rather than what he says."
He added: "We actually have a number of measures already on the statute books which allow us to keep a very close eye on those people who aren't in prison, aren't sentence but are perceived to be a threat to the UK."
A British family have told ITV News of their devastation after discovering a close relative is fighting with the Islamic State in Iraq.
A French journalist who was held hostage with James Foley in Syria has told ITV News it was "devastating" to see his murder.