Corruption inquiries have hit a record high at the nation's law enforcement agencies in a telling sign of misconduct at the same time federal politicians face a united media campaign against government secrecy.

The federal integrity commissioner has disclosed the "highest ever" number of ongoing corruption issues being investigated, with the workload growing by 20 per cent to have 278 investigations under way at the end of June.

Prime Minister Scott Morrison has countered media industry calls for six reforms to protect press freedom. Credit:Alex Ellinghausen

The peak agency has also named online gambling as a factor in the corruption of law enforcement officers, saying it makes it more difficult to detect problems compared to public gambling.

The findings come as Prime Minister Scott Morrison counters media industry calls for six reforms to protect media freedom including stronger laws to protect whistleblowers who reveal public sector misconduct.