The Morrison government's only hope of passing its union-busting bill this week rests with Tasmanian senator Jacqui Lambie, after One Nation leader Pauline Hanson said she was not convinced it was fair to workers.

"I'm talking to the unions, I'm hearing from the other side, and I will not go out union bashing if you are going to allow corporate Australia to not do the right thing by their workers," she told reporters in Canberra on Tuesday.

"It's got to be fair and just. And I will not be pushed."

Pauline Hanson says she will not help the government 'rush through' its union bill. Credit:Alex Ellinghausen

Senator Hanson said she would not support the Ensuring Integrity Bill in its original form, which would make it easier to deregister unions and disqualify officials, and had not been consulted on amendments by Industrial Relations Minister Christian Porter.