The Achilles' Heel of Trump's schemes to override the votes of the American People is that he needs to be ahead or virtually tied with Biden on Election Night. If at the end of Election Night, Biden is clearly ahead of him and winning the Electoral College, Trump's best chance to steal the election is destroyed. So we must vote to be counted on Election Day.
Democrats should threaten to pack the court. And, if McConnell pushes through a new justice and then Joe Biden wins, they should follow through.