[musanon]

Even Amendments must be compatible with the principles of the Constitution. -- Marshall said as much in M v M, -- that any law 'repugnant', - is null & void.

A Constitutional Amendment is not a "law". It is a completely different animal.

The Constitution and its Amendments are the "Law of the Land". -- See Article VI.

[Wonder Warthog]

"The Constitution and its Amendments are the "Law of the Land". -- See Article VI."

Which is not the same thing as "a law passed by Congress". I say again---Amendments to the Constitution are NOT the same as laws passed by Congress. The Supreme Court has no power to nullify such.