Both the premier and several of his cabinet ministers have been hiding the truth and covering up during the gas plant documents scandal, Progressive Conservative Leader Tim Hudak claims.

"The house was clearly misled by (Energy) Minister Bentley, by Premier (Dalton) McGuinty and by a number of cabinet ministers from Dwight Duncan to John Milloy," Hudak said Thursday.

"Dalton McGuinty's decided to retire. I think there is now a burden on the Liberal leadership candidates from Kathleen Wynne to Dwight Duncan to Glen Murray to come clean."

Hudak said he has no doubt McGuinty's sudden decision to resign and prorogue the house until a new Liberal leader is chosen is directly related to the gas plant issue.

McGuinty has denied that, saying he was retiring after nine years as premier to give the party a chance to renew itself. The decision to prorogue, he said, was to allow the government to negotiate either wage freeze deals with public sector unions, or wage freezing legislation with the Tories - and to cool tempers after a fractious session in a deadlocked, minority legislature.

Hudak said he is willing to listen to the Liberals on how they can toughen up their first, failed attempt to please his party with a wage freeze bill but will only accept one that has "teeth."

He's also maintained the contempt motions his party is bringing against Bentley for withholding gas plant documents will return when the house does.

New Democrat house Leader Gilles Bisson said he too, doubts the Liberal rationale for shutting down the legislature.

"It's pretty clear to me the Liberals are more interested in doing what's good for them rather than what's good for the people of Ontario," Bisson said.

"There are plenty of issues that need to be dealt with. According to the legislation passed by the Liberals, a review of the LHINS has to be done - it's not happening. My colleague today was going to have a bill regarding clean trains in Toronto  - that bill is not going to be debated om this house.

"There are all kinds of things that need to be done through the legislature that won't be done because the Liberals are gaming this prorogation because they don't want to get before that committee and they want to run a leadership campaign with nothing in the background."