"Next (also 1913) Corp. U.S., through Congress, adopts (as if ratified) its 17th amendment. This amendment is not only not ratified, it is not constitutional; the nation's Constitution forbids Congress from even discussing the matter of where Senators are elected, which is the subject matter of this amendment. According to the United States Supreme Court, for Congress to propose such an amendment they would first have to pass an amendment that gave them the authority to discuss the matter."
Is there a Supreme Court ruling to this effect (i.e., that for Congress to even propose such an amendment, first an amendment that gave them such authority would have to be passed?") If so, what is it?