If Prime Minister Malcolm Turnbull hasn't found anyone who thinks his Senate voting laws are unconstitutional, he hasn't been speaking to the same people as Bob Day.
The Family First senator, who is challenging the laws that make it more difficult for micro-party candidates to be elected, says he's got very strong community support.
The High Court will hear Senator Day's challenge from Monday.
It's expected to make a ruling before May 11, the final day Mr Turnbull can call a double dissolution election.
The prime minister said on Sunday he was "untroubled" by what the High Court would determine.
"I have every confidence that the Senate voting reforms are entirely constitutional; I haven't actually found anyone that would disagree with that," Mr Turnbull told reporters in Sydney.
Senator Day later fronted a Sydney rally of more than 300 people who supported his position.
"(Mr Turnbull) hasn't been talking to the people I've been talking to obviously," he told AAP.
"I've met a lot of people who are confident that we have very good grounds and good arguments."
The changes, which passed the parliament in March after marathon debate in the Senate, mean voters will be able to allocate their own preferences above the line.
If they choose to vote below the line, they will only have to number 12 boxes - not every single box, which can be more than 100.
Senator Day and other crossbenchers are upset the rules also abolish group voting tickets, which help micro-party candidates win upper house seats with a very small primary vote.
Opposition Leader Bill Shorten said on Sunday the "ill-advised" changes were clearly about squeezing out the independents.
"We recognise that three million Australians voted for a political party other than Labor, the Greens or the Liberals," he told reporters in Melbourne.
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