The increasingly bitter dispute over the employment rights of more than a million temporary and agency workers could come to a head today when the Prime Minister meets union leaders.
The meeting comes after a private member's Bill giving new rights to agency staff received strong support in the Commons last week.
The Bill, promoted by Labour MP Andrew Miller (Ellesmere Port and Neston), gained a second reading by 147 votes to 11, with former minister Peter Hain among more than 130 Labour MPs defying the Government which does not support legislation.
During today's talks in Downing Street, Gordon Brown will spell out his idea of a commission to examine the arguments for and against measures to tackle abuses of staff employed through agencies or those on temporary contracts.
Mr Brown will say that the commission will be modelled on the Low Pay Commission which led to the creation of the national minimum wage and would be chaired by Sir George Bain.
There are estimated to be 1.4 million workers employed as temporary or agency staff, and union leaders reacted with delight at support for Mr Miller's Bill. The Government is now under pressure to come up with a deal acceptable both to unions and business groups.
Employers have argued strongly against the need for a new law, maintaining that agency workers already have protection covering pay, holidays and conditions.
The CBI warned that 250,000 jobs could be hit if the Bill becomes law while many major business groups said that the UK's flexible labour market would suffer.
But Tony Woodley, joint leader of Unite, who will attend today's meeting, said that he believed the Commons vote had "quashed" the idea of a commission.
"The evidence of the need for legislation now is overwhelming and we will not accept the promise of jam tomorrow."