I'd be advising to challenge every issue and also to challenge the validity of no reason mail-in voting under State Constitutions. On my reading the Pennsylvania Constitution does not allow it.

Challenges that call the validity of entire vote into questions like the exclusion of observers, mail-in ballot defects and the Penn case above should be the focus.

The State Legislatures won't take action until there are Court rulings calling vote totals into question.

Those rulings will come.

GOP's interest is same as Trump here. As Senator Lindsay Graham said, if widespread mail-in votes and the fraud associated with it is not stopped here, it will make it much more difficult for the GOP to win elections in future.

A blockchain based system with lifetime voter verification via public/private key encryption but using z-snark or similar privacy protocols is part of the solution.

Its really a joke that so many States are using voting software that has been compromised for years and antiquated mail-in vote systems.