Impeachment is a political - NOT criminal - process.
"High crimes and misdemeanors" in the sense of Impeachment does NOT necessarily mean a "crime" in the criminal law sense has been committed.
Again, Impeachment is a *political mechanism* by which a legislature may bring "charges" against a sitting official and upon conviction remove that official from office.
A govt official does NOT need to be "criminally charged" to be impeached & removed from office.