Independent senator Jacqui Lambie continues to claim she never struck a secret deal with the prime minister in order to win her support for the repeal of so-called medevac laws.
This is despite her previous threats to reveal details of their negotiations if Scott Morrison refused.
"There was no deal, there was no deal," she told ABC radio on Tuesday.
The medical evacuation laws were passed against the Morrison government's will in the final sitting week of 2018.
The legislation shifted the power to determine whether sick refugees should be brought to Australia from offshore attention away from the government, to two treating doctors.
The bill was later overturned after Senator Lambie voted with the government and One Nation.
The Tasmanian senator told parliament at the time she supported the legislation's repeal because the government agreed to an outcome that would improve medical treatment for refugees in offshore detention.
The prime minister has consistently denied a deal was made.
Senator Lambie has previously declined to disclose details of the negotiations, citing national security concerns, but pledged to do so at some point.
Late last year, she said the nature of the deal would be soon become clear.
"And if the prime minister doesn't do it, I will," she said at the time.
"So he can go and threaten me with jail or whatever he likes on a piece of paper. I don't care. But if he doesn't tell you by the end of the year, I will. How's that for you, right? He's had long enough."
Instead, the crossbench senator is now encouraging people to look at the flow of people coming off detention from Nauru, saying there had been quite a large number in the past 12 months.
"I don't do deals over humanity," Senator Lambie said.
"What I do is try and work out what is best for those people in those sort of situations, and how we can get them to get on with their lives and put the pressure on from that side."
Asked if and when she would reveal details of the medevac legislation repeal, Senator Lambie initially responded: "Yeah, I'm getting extremely frustrated by it, I have to be honest."
"I'll be getting another briefing either late this week or when I come to sit not next week, the week after," she said.
"I'm just seeing how many people are still left on Manus, what is going on in that area, what is going on with those who are confined here in Australia that were on medevac.
"Whether or not they can go back to their countries, why they're still in detention centres or hotels."
Australian Associated Press