The Queensland MP who quit the LNP over its changes to electoral donation and advertising laws said the current donation laws were "not only unnecessary" they were "actively eroding" public trust.

The former member for Stafford, Chris Davis, whose resignation led to a historical swing against the government in the July by-election, told a Transparency International debate late last week that he had been "ruthlessly ready" to take the long view on election donation and spending laws "and was dealt with equally ruthlessly".

Chris Davis says political donations and advertising are eroding public trust.

Dr Davis developed a reputation for speaking out against government policy he believed was "ill-advised", including the doctor contracts dispute.

He polled his electorate ahead of the parliamentary vote on changes to the Crime and Misconduct Commission and found the majority of respondents were against the changes.