The Nuclear Option

[bae]

Where is this "60% rule" to be found in the Constitution?

What has the Court said about the ability of the Senate to make and alter its working parliamentary procedures?

[Alan]

Where is this "60% rule" to be found in the Constitution?

Ratification of a treaty, override of a veto, votes of impeachment, passage of a Constitutional amendment, and expulsion of a member. All else is up to the Senate's own rules, which have varied over time.

What has the Court said about the ability of the Senate to make and alter its working parliamentary procedures?

I don't know, but if you're talking about the Supreme Court, and we take it as a given that it's rulings are non-political, I think they'd say that outside the 5 instances mentioned above, the Senate may conduct themselves in any manner a majority of their representatives approve.

[jp1]

Where is this "60% rule" to be found in the Constitution?

I hunk it's next to the part that says presidents don't have the right to appoint a Supreme Court justice when they only have eleven months left in their term.