Independent senator Jacqui Lambie says she will vote to repeal the medevac bill if the government accepts her one condition.
Although Ms Lambie did not reveal her condition, it is understood to relate to national security issues.
Ms Lambie’s says her position on the legislation has “considerable community interest”, which will determine the fate of the medevac regime.
“I am of the firm and conclusive view that the continuing operation of the Medevac provisions cannot be disrupted without this condition being met,” Lambie said.