Mr Miller is exonerated but the ruling is controversial

A parliamentary investigation ruled film producer Lew Rywin had acted alone in asking a publisher for $17.5m in return for changes to a media law.

But opposition MPs on the committee accused Mr Miller's allies of using their majority to exonerate him.

Mr Rywin, co-producer of the Oscar-winning Schindler's List, is on trial for the scandal. He denies the charges.

This investigative committee ends its work in disgrace Jan Rokita Committee member

In a sign of mounting controversy over the ruling, committee chairman Tomasz Nalecz refused to present their report to the whole parliament at a forthcoming session.

"This investigative committee ends its work in disgrace," another opposition member, Jan Rokita, was quoted as saying by Reuters news agency.

Mr Miller has persistently denied any involvement in the cash-for-legislation scandal, which has gripped the public attention for over a year now.

'Powerful people'

But the scandal is thought to have contributed to the fall in the government's approval ratings, forcing Mr Miller to announce his resignation last month.

Mr Rywin, a famous Hollywood producer, denies the charge

He will leave on 2 May, the day after Poland joins the European Union.

Mr Rywin, the co-producer of the Oscar-winning film Schindler's list, is facing three years in prison if convicted on bribery charges.

Prosecutors say he asked the publishers of the country's leading daily, Gazeta Wyborcza, for the bribe in 2002.

In return, they say, he promised to lobby the government to change a media bill, which would allow the newspaper's parent company to buy a TV station.