Failing to uphold the Constitution is not treason. Treason would be if one tried to sabotage American military aircraft during wartime or attempt to assassinate a monarch or dictator, which doesn't apply to America.
Treason is a legal term. There's no adequate legal term for violating the constitution because our founders never established penalties for public officials who violated it, other than being removed from office by their. Maybe they should have, maybe if they had, it would have been abused and opened a whole new can of worms, I don't know. I do know that word "treason" is like the word "love," vastly overused.