Sky, the BBC and ITV have joined forces to push for a series of live televised debates with the leaders of the three main political parties.

The broadcasters have written to Prime Minister Gordon Brown, Conservative leader David Cameron and Liberal Democrat leader Nick Clegg outlining their joint proposal.

The three debates would take place during the next General Election campaign.

Cameron and Clegg have already agreed that they would take part in such a debate - Labour leader Gordon Brown has only said he is considering participating.

Each broadcaster would be responsible for producing and showing one debate between the three.

The debates would be transmitted live by the original broadcaster in peak time and made available to all other British broadcasters.

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