Ontario NDP Leader Andrea Horwath says the June 12 provincial election is a "referendum on corruption."

Horwath is making several campaign stops around the Greater Toronto Area today, saying the party is hearing from some traditional Liberal or Progressive Conservative voters who say this time they will vote NDP.

She says Liberal Leader Kathleen Wynne "has been running from the Liberal record of scandal and she cannot get away from it."

Police investigating the alleged destruction of government documents related to the cancellation of two gas plants by the Liberals have asked for key records from the Legislature.

Ontario Provincial Police are seeking visitors' logs and other records in the investigation that earlier determined some hard drives in the former premier Dalton McGuinty's office had been wiped clean of data.​

CBC News has confirmed that the OPP served a court order to staff at Queen's Park Thursday asking for documents relating to the gas plant scandal.

Horwath referred to the police visit to the Legislature as another reminder of why the province needs a change of government.

Recurring theme

"People are tired of the stench of corruption in this province and they want it cleaned up," the NDP leader said.

"This election is about corruption. This is a referendum on corruption."

Horwath's corruption allegations have been a recurring theme of the NDP campaign.  

"We don't have to have a corrupt Liberal government that disrespects people's tax dollars, that disrespects their information, and that behaves in a criminal way when it comes to covering up scandals," she said Friday. 

The NDP and the Progressive Conservatives are calling on Wynne to make key Legislature records public immediately.

"We shouldn't have to wait until after June 12 to see what's in those documents to get a sense of what it is the OPP are looking for," Horwath said.