The filibuster is not enumerated in the Constitution...nor is it prohibited by it.<quoted text>
When you're not actually engaging in any debate, but simply blocking every nominee for the sake of blocking every nominee, that's obstructionism; not good government.
The Filibuster is not part of the Constitution.
If a challenge were to be brought before the SC, this would actually be a very complicated matter, based on Article I, section 5 and the fact that it's clearly established by precedent as a consistent senate rule for the last 217 years. If the senate wants to vote on rule changes, it should be done according to Article I, section 5.