How did the 'gang of 14' violate the constitution? I realize that you are saying fillibustering where Advise & Consent is supposed to take place was a violation (and I concur). But the 'gang of 14' was put together as a 'peaceful' way to stop the fillibustering from happening.
Maybe I'm missing something here, so please enlighten me.
Simple. The Gang of 14 stopped the Nuclear Option from being put in place, which in turn leaves the Executive appointments filibuster still in place as a Dim option.