Key crossbench senator Jacqui Lambie has backed the government's plans to expand cashless welfare card trials, but will only back drug testing of welfare recipients if politicians "grow a spine" and submit to the same screening.
The Morrison government will reintroduce two lapsed pieces of legislation targeting Newstart and Youth Allowance recipients when parliament sits this week, its first gathering after the long winter break.
Senator Lambie, who could hold the deciding vote, said she had visited areas where the cashless welfare cards had already been rolled out and it was working.
