Labor is piling pressure on the prime minister to sack embattled Energy Minister Angus Taylor.
Mr Taylor has faced a series of scandals and is under police investigation for using doctored documents to attack the Sydney lord mayor.
"If the prime minister had any courage he would sack Angus Taylor," Labor frontbencher Tanya Plibersek said on Thursday.
As the police investigation continues, a Labor and Greens-dominate Senate committee has found Mr Taylor breached ministerial standards.
The committee investigated Mr Taylor's private financial interests in Jam Land Pty Ltd, a family company subject to a compliance investigation by his own department.
In an interim report released on Wednesday night, the committee found Mr Taylor failed to disclosed his interests and sought to use his position to obtain special treatment.
Mr Taylor's actions represent not only a contravention of the Morrison government's own ministerial standards, but have also fallen well short of the public expectations of the integrity of the government and parliament," the report said.
Unsurprisingly, coalition members of the committee issued a dissenting report.
They accused Labor and the Greens of a "blatant abuse and misuse" of the Senate committee process.
Mr Taylor has consistently said he complied with the rules around the declaration of personal interests.