The Morrison government has voted to stop an inquiry into Porter donations.
Former attorney-general Christian Porter has avoided an investigation into whether his acceptance of mystery legal donations was in contempt of parliament.
The coalition government on Wednesday voted down Labor's motion to refer the MP for the Western Australia seat of Pearce to parliament's privileges committee.
Manager of opposition business Tony Burke accused the government of running a "protection racket" for Mr Porter over who helped fund his defamation case against the public broadcaster.
"We need to oppose a system where members of parliament can keep secret who is giving them money for personal bills," Mr Burke told parliament.
"If this is allowed to stand, the register of members' interests is obliterated in terms of being a disclosure document."
The Morrison Government just voted to stop an inquiry into Christian Porter’s secret donations. pic.twitter.com/gMMZ1vnTmM— Anthony Albanese (@AlboMP) October 20, 2021
Speaker Tony Smith was "satisfied that a prima facie case has been made out", paving the way for a vote on whether Mr Porter should be investigated for possible contempt of parliament.
The opposition sought to refer the MP to the standing committee that looks at MPs' responsibilities in declaring their financial interests.
Leader of the House Peter Dutton instead proposed a broader inquiry into anonymous donations, including those from online donor platforms.
"There is a sensible discussion to be had at the appropriate time between the government and the opposition to see what the appropriate next step might be for this parliament," he said.
Mr Porter last month updated his parliamentary register of interests to disclose anonymous legal donations used to help fund defamation action over an allegation he raped a now-deceased woman in 1988.