However, engineers and a report by the National Institute of Standards and Technology have firmly concluded that the building collapsed due to structural weakness induced by fire. "Further investigation needs to be done," Mr Pecora said on Thursday. "It is unprecedented in the history of modern construction for a building just to fall down like that at freefall speed." Asked whether he believed the US government and then-president George W. Bush played a role, he said there were many "layers" of the US government that might have been involved. "You have sections of the US government that killed JFK," Mr Pecora said. "You have sections of the US government that maybe do not have the US constitution as their sole focus. Maybe they are working alongside globalist forces."

Mr Pecora said there was a "civil war" within the US government between patriots and globalists, and blamed "central banking cartels" as the driving force behind globalism. "If you look at the International Monetary Fund and the World Bank syndicate and why they are pushing the idea of climate change so strongly, it's because having a global-based carbon taxation system is one of the most effective ways of centralising financial power," he said. Clive Palmer is fielding candidates in all 151 lower house seats and spending more than $50 million. Credit:AAP It is understood Mr Pecora made similar remarks about the September 11 attacks at a recent candidates' forum hosted by the Kensington Association in Melbourne. David Smith, a senior lecturer at the University of Sydney's United States Studies Centre, said it was "deeply disturbing" to see a candidate for political office espousing conspiracy theories that had been comprehensively debunked.

"To believe in a 9/11 conspiracy theory at this point indicates a world view in which you distrust scientific authority, in which you distrust credible expertise and where you trust all of the wrong sources," Dr Smith said. Loading "I don't know what else Clive Palmer has to work with [but] I certainly wouldn't want something like that associated with a political party I was running." Mr Pecora, who installs solar power systems in Australia and the South Pacific, according to his official candidate biography, is also opposed to mandatory child immunisation. He said many vaccinations were effective but to make them compulsory was "totalitarian". "It's a very scary world when we are introducing policy that we have to inject heavy metals and what are live diseases into the bloodstream of infants," he said. "That's mandatory? Wow, that's hardcore."

Confirming Mr Pecora had been sacked by the party's executive, Mr Crook said: "He does not represent the party views or policy and has not shown the right intent to represent his electorate or the views of our 150 candidates around Australia." Mr Palmer's party has refused to condemn another vaccination-sceptic candidate, Alexander Stewart in the seat of Cowper, and says it has not finalised its position on immunisation. The UAP had fielded candidates in all 151 lower house seats and has entered a preference deal with the Coalition that will boost Mr Palmer's chances of being elected to the Senate. The mining magnate has boasted of spending more than $50 million on the campaign, including newspaper, radio and television advertisements, text messages and billboards.