Assistant Treasurer Michael Sukkar has accused Labor of giving the Construction, Forestry, Maritime, Mining and Energy Union a "free pass", calling on the Opposition to support the government's push to deregister the organisation.

“The Labor party could assist the CFMMEU and other rogue organisations reform themselves and improve their performance and improve they way they operate within the law by actually putting some pressure on them," Mr Sukkar told Sky on Sunday.

Michael Sukkar says Labor has given the CFMMEU a 'free pass' and must support the government's crackdown. Credit:Dominic Lorrimer

Instead, he said, Labor had accepted repeated misconduct by the union and its officials, while opposing government legislation aimed at improving governance and integrity around unions.

“Presumably, the Labor party can’t bite the hand that feeds them,” Mr Sukkar said.