The union official who began a push to expel Labor veteran Martin Ferguson from the ALP for his views on privatisation believes the official story of how the Twin Towers in New York were brought down on September 11, 2001 is a conspiracy that does not stand up to scientific scrutiny.

Maritime Union of Australia official Kevin Bracken last week moved a motion condemning Mr Ferguson for publicly supporting power privatisation in New South Wales during the recent state election and urging the Victorian branch of the Labor Party to kick him out. That motion was unanimously passed by all state leaders of affiliated unions.

Kevin Bracken says Martin Ferguson should be kicked out of the Labor Party. Credit:John Woudstra

Mr Bracken told Fairfax Media on Wednesday that he did not resile from his views - expressed in an interview with the ABC's Jon Faine back in 2010 - that "the official story is a conspiracy theory that doesn't stand up to scientific scrutiny".

"I'm happy to debate my views [on 9/11] with anyone who wants to debate them, I am happy to debate it on scientific principles," he said.