Labor has defiantly backed the administrator of the scandal-riddled CFMEU against claims made relating to ongoing allegations of misconduct within the union.

Administrator Mark Irving KC reportedly ditched two anti-corruption teams hired to uncover misconduct in the union as concerns were raised over the probe's investigative capacity, according to Nine newspapers.

The revelations prompted calls from the coalition for a parliamentary inquiry into the administration, which it claimed had avoided parliament and "proper scrutiny".

Employment Minister Amanda Rishworth dismissed the "absolutely baseless claims" in parliament on Monday, calling them a disgrace.

"(The coalition) ... might want to play politics with this issue," she said.

"We want to see a construction industry free from corr

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