Tasmanian senator Jacqui Lambie has reached a deal with the government to repeal the medevac laws, but says she can't discuss the details due to "national security concerns".
Senator Lambie confirmed with the Senate this morning that she had struck a deal, however her admission came just after the government's Senate leader Mathias Cormann denied such a deal.
It resulted in heated exchanges between Labor and the government benches, with the repeal of the legislation - which gave doctors a say in transferring people in detention to Australia for medical treatment - to pass imminently.
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Senator Lambie said she understood that there was a perception that politicians hide behind "national security" concerns to avoid discussing important matters, but it was not the case in this instance.
"I genuinely can't say what I proposed," she told the Senate.
"I know that's frustrating to people and I get that.
"I don't like holding things back like this, but when I say I can't discuss it publicly due to national security concerns, I am being 100 per cent honest to you.
"I am voting for the repeal of medevac because I am satisfied that the conditions that lead to medevac being passed aren't the same as the conditions today.
"This is a matter of conscience. I can't let the boats start up, I can't let refugees die whether it's sinking in the ocean or [failing to get medical treatment]."
Labor and the Greens sought to extend debate so her deal could be discussed, with shouts that the deal was "undemocratic".
Greens leader Richard Di Natale said the Australian people deserved to know what deal had been struck.
"We heard Senator Cormann say there's no deal, now we've heard Senator Lambie say there is a deal," he said.
"We just heard that you and Senator Lambie have worked on a secret proposal in good faith that she could not disclose for so called national security reasons.
"Who's lying? Who's misleading this parliament?
"Someone is misleading the Senate about one of the most important pieces of legislation that has been before this parliament."