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Conservative Party chairman Grant Shapps said "all options are on the table" for pre-General Election debates after reports suggested Ukip leader Nigel Farage could be included.
Speaking on the Sky News Murnaghan programme, Mr Shapps said negotiations on the format and timing of debates would not begin until the autumn.
But he said: "We think the debates were a good innovation, they were something new at the last General Election.
"There was a bit of a problem they all took place during the General Election, people across the country didn't get to see the party leaders and the debate properly in their local area.
"It's quite possible not to bunch them up in a campaign now we know the election date is May 7. Beyond that there is no negotiations under way, that will have to wait until the back of this year. All options are on the table right now."
Ukip leader Nigel Farage said David Cameron has "no intention" of allowing him to be part of any televised debates ahead of the next General Election.
The Prime Minister "has not ruled out" a debate with Mr Farage in the run-up to next year's election, according to The Sunday Times (£).
However, the Ukip leader told The Andrew Marr show: "I think what David Cameron does very often, is make these promises - vague promises - and then doesn't deliver afterwards. I don't think he's [David Cameron] got any intention of allowing me into any of these debates."
Labour leader Ed Miliband said it was the broadcasters decision as to who was involved in the debates but added he did not want Mr Cameron "to wriggle out" of them.
He said: "We've got to have debates like we did during the last election, I think David Cameron is doing everything he can to wriggle out of them...it's up to the broadcasters who they invite, whether they invite Nigel [Farage] or not, my main desire is that the debates go ahead."
Ukip leader Nigel Farage has repeatedly challenged the Prime Minister to a televised debate.
His most recent call to face Cameron on air came last week in response to claims he was "chicken" for ruling out a run at Parliament in the Newark by-election.
The Ukip leader said: "Mr Cameron said ... that I was a chicken. Well, I'll tell you what Dave, why don't you come on telly and do a debate with me?"
David Cameron "has not ruled out" a TV debate with Ukip leader Nigel Farage as part of a series of broadcast showdowns ahead of the 2015 election, The Sunday Times (£) reported.
Under the "2-3-5" format drawn up by his aides, Mr Cameron would hold one head-to-head debate with the Labour leader - as the other potential prime minister - a second, which would also include Liberal Democrat leader, Nick Clegg and a third with Mr Farage and the Green party leader Natalie Bennett.
A No 10 source said: "It is speculation on what might happen in talks that are not going to happen for several months."We have not ruled anything in or out, so that means people can speculate what might happen in the talks."But the reality is these talks are several months away."