Pauline Hanson is preparing to front the media over a scandal engulfing her One Nation party after appearing to insinuate the 1996 Port Arthur massacre was a government conspiracy.
Two senior One Nation officials have also been caught talking about asking the American gun lobby for $US20 million.
Hidden camera footage, released by Al Jazeera as part of an undercover operation, showed Senator Hanson saying she had "a lot of questions" about Port Arthur.
"An MP said it would actually take a massacre in Tasmania to change the gun laws in Australia," Senator Hanson told Al Jazeera reporter Rodger Muller.
"Haven't you heard that? Have a look at it. It was said on the floor of parliament.
"I've read a lot and I have read the book on it, Port Arthur. A lot of questions there."
NSW party leader Mark Latham said the comments didn't match up with his exchanges with Senator Hanson.
"I had a discussion with her about the making of the Howard gun laws and she didn't raise any doubts about the veracity of the truth of what happened at Port Arthur," he told Seven's Sunrise on Thursday.
Another of Al Jazeera's videos showed Queensland One Nation leader Steve Dickson and Hanson's chief of staff James Ashby speaking to the undercover reporter about potential donations.
The men claim they were "on the sauce" when the conversation took place.
Prime Minister Scott Morrison said being drunk was no excuse and has urged Australians to abandon the conservative minor party.
In the Al Jazeera footage, Mr Dickson says One Nation could get the government "by the balls" through holding the balance of power in both houses if they could get millions in funding.
That would allow them to weaken Australia's gun laws, a point they raised with powerful lobby groups in Washington DC, including the National Rifle Association.
Senator Hanson broke her silence on Wednesday, saying she was shocked and disgusted with the "hit piece" by Qatari TV network Al Jazeera.
"A Qatari government organisation should not be targeting Australian political parties. This has been referred to ASIO," she tweeted.
The One Nation leader has been suffering from a tick bite on her face for the past week, but is expected to speak publicly on Thursday.
Labor leader Bill Shorten has repeatedly called for the prime minister to back up his condemnation of One Nation by putting them last on Liberal how-to-vote cards.
Mr Morrison has consistently said the Liberals will wait until final nominations before deciding on its preferences.
Mr Ashby said the pair spoke only with undercover Al Jazeera reporter Rodger Muller about the potential $US20 million in donations.
Mr Muller posed as the head of fake lobby group Guns Rights Australia and initiated the One Nation meetings with the NRA.
Mr Ashby accused Mr Muller, who is Australian, of being a "Middle Eastern spy".
Australian Associated Press