Greg Sargent interview:

Pennsylvania officials tried to preempt this by announcing that they will segregate all late-arriving ballots. The idea is to prevent Republicans from challenging those ballots and then using that to challenge all mail ballots, by claiming they’ve all been commingled and can’t be separated from one another, requiring a halt to the count until the legal dispute over the late ballots is resolved.

“A careful decision was made to try to stave off the anticipated legal challenges by Donald Trump and his enablers,” Shapiro told me, though he declined to comment on how their strategy might unfold.

There are many reasons to doubt such a scheme could succeed. But the Supreme Court hasn’t given us grounds for assuming there’s nothing to worry about.

Here’s why.