There is no crime of “high treason.” Not in the USA.
Treason is the only crime defined in the Constitution.
“Treason against the United States, shall consist only in levying War against them, or in adhering to their Enemies, giving them Aid and Comfort. No Person shall be convicted of Treason unless on the Testimony of two Witnesses to the same overt Act, or on Confession in open Court.”
Interestingly, numerous states used to prosecute for treason against the State. That’s what John Brown was hanged for.
Hanging sounds so...so permanent, but is an option.