The Andrews government has seized on allegations a police officer and former Liberal candidate leaked details of crimes to 3AW radio host Neil Mitchell before the last state election.

Deputy Premier James Merlino has demanded answers after the Frankston Standard Leader reported Senior Sergeant Michael Lamb, who ran for the seat of Frankston, leaked information about 21 crimes to Mitchell.

Senior Sergeant Lamb was suspended with pay in February last year after being charged with four counts of disclosing police information without reasonable excuse following an internal police investigation.

Then-Liberal leader Matthew Guy addressed the media with his wife Renae and Frankston candidate Michael Lamb (right) on November 19, 2018. Credit:DAVID CROSLING

The Andrews government has called on former Liberal leader Matthew Guy and current leader Michael O'Brien to answer questions about the allegations.