Mr Donaldson said in the media release last week he believed Rotorua's interests were being compromised by the trio's decision.
In his complaint sent to council chief executive Geoff Williams, Mr Kent singled out a paragraph from the media release where Mr Donaldson stated: "I am appalled by what I have read in the paper today from some elected officials who are happy to keep their head in the public trough but not partake in the business. They should resign now and take their chances in the upcoming elections."
Mr Kent said in his opinion: "This statement is undeniably aggressive, libellous,
derogatory, and deliberately intended to influence the outcome of the coming elections with regard to sitting councillors McVicker and Bentley, and to myself with respect to my upcoming mayoral candidacy".
Mr Kent said while elected members were free to express personal views in the media, at any time, this was required to comply with the code of conduct and in his opinion in this instance it ''clearly does not".
It was also his opinion that any such personal view of a councillor should not be distributed in the form of an official press release, which he believed inferred the views were those of council, he said.
This was, in his opinion, a ''misuse of council resources" and breach of the code of conduct.
Mr Kent said he was awaiting a response from the chief executive before deciding whether to lodge his complaint with the auditor-general and Electoral Office.
Mr Williams confirmed he had received the complaint and told the Rotorua Daily Post Mr Kent had raised a number of issues and answering the complaint was not straight forward.
He said due to the complaint's complexity he had decided to seek an external opinion before responding to Mr Kent.
Mr Donaldson said he was aware of Mr Kent's complaint and had no comment to make.