The prime minister has rejected David Cameron's call for immediate reform of the system of expenses for MPs.
The Conservative leader said he was "fed up with our politics being driven through the mud".
And he told the Commons that a system with greater transparency and lower costs is vital.
Rejecting the need to wait for another review, he called for an urgent meeting of party leaders to "sort this out once and for all".
But Gordon Brown said the whole system "has to be reformed and improved".
The prime minister said he was happy to hold talks with party leaders, but insisted that the Committee on Standards in Public Life should be able to complete its review.
Responding, Cameron said "we don't need another review".
"The public are sick and tired of the situation. What it requires is political leadership," he added.
And he called for action "not in six months' time, not in a year's time but right now".
Brown insisted, though, that the aim should be "to satisfy the Committee on Standards in Public Life as well as ourselves".
"I believe we have got to satisfy more than ourselves about the standards in public life," he said.


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