He didn't try to cancel the primary, he tried to postpone it and allow for mail-in voting.
By refusing, SCOTUS told the voters in WI that they must put themselves at risk to exercise the franchise right to vote.
Now, there are hundreds of thousands of people in close proximity, using voting machines, pens, touching everything at the same time the CDC recommends the opposite.
By forcing through the vote today, after other states (including my state of GA that had postponed our primary to May), the GOP is committing voter suppression.
I just got my Absentee Ballot Request in the mail yesterday from the Secretary of State; every registered voter in GA is getting one. Why couldn't WI have done the same to ensure a safe and fair election? Because they don't want safe and fair elections, hence: