DAVID Cameron will dump Nick Clegg once he has "gerrymandered" the electoral system, says Labour heavyweight David Miliband.

The former Foreign Secretary claimed the Prime Minister was interested in power “above all else” and would not call an election until constituency boundaries had been changed in the Tories’ favour.

Mr Cameron has vowed to slash the number of MPs and equalise the size of constituencies, claiming it will produce a more fair and cheaper system – although Labour fears it will unfairly disadvantage them.

Mr Miliband, who represents South Shields, also told The Journal that he never thought Labour would strike a coalition deal with the Liberal Democrats after last year’s general election produced a hung Parliament.

But he warned the Labour party, led by his brother Ed, that it had to prove it would be a better Government rather than just enjoying Lib Dem suffering.

He said: “The Lib Dems claim to be the partners in the coalition. I say they are the puppets in the coalition.

“And if they are the puppets, then the puppet-master is David Cameron – and so Labour has to understand that it has to take on the puppet-master not just the puppet.

“Our case has got to be that we will be a better Government than the Tories. We shouldn’t enjoy Lib Dems’ discomfort so much that we lose sight of the real enemy.”