[Daveinyork]

The Supreme Court can declare the changes to be unconstitutional. I doubt if a Constitutional amendment goes anywhere.

[libertylover]

The Supreme Court can declare the changes to be unconstitutional. I doubt if a Constitutional amendment goes anywhere.

I expect that Biden might try to do it with an Executive Order.

[scrabblehack]

They would be. They were confirmed to lifetime appointments.
Also the Constitution calls for lifetime appointments.