The Prime Minister has expressed concern that the leaders' TV debates could detract from "issues" in next year's general election, despite saying he thought they were "good".
Speaking on The Agenda, he said the debate on ITV before the last election "took all the life out of the rest of the campaign" and became a "commentary on who was doing well or badly in the TV debates".
He also said he didn't think Ukip could be included in the debates without offering the same opportunity to the Green Party.
Watch the full discussion on The Agenda on ITV at 10.35pm tonight
The invite to participate in TV debates ahead of the election has been delivered - it's now up to the political leaders to accept or refuse
ITV, BBC, Channel 4 and Sky have revealed their plans for a series of live party leader debates in the run up to the 2015 General Election.