[Sidebar Moderator]

The problem is that the courts have traditionally given the Senate wide leeway on how it runs things. So we’re not out of the woods yet.

Bingo. Very uncharted territory.

[pierrem15]

SCOTUS has been very deferential regarding parliamentary procedures, such as the filibuster or rules regarding how bills are brought to the floor.

This isn't the same: it's about whether the Senate can act in this case to exercise a power explicitly delegated to it by the Constitution.