If impeaching Trump is legally right, constitutionally right and morally right, how does one

[marylandblue]

19. "high crimes and misdemeanors" is a term of art from the British Parliament

They used that specific phrase when impeaching royal officers. They could impeach for whatever they wanted, whether it was an actual crime or not. They impeached one person for breaking a promise to Parliament. They impeached the Attorney General for failing to complete prosecutions. The whole point of impeachments was to do it in a political rather than judicial context, at Parliament's discretion, not because the law required it.

The main difference between British impeachment and ours is that our impeachment can only lead to removal from office, but Parliament could impose criminal penalties as well. The founders wanted political judgement to control removal from office but wanted the courts to control actual legal violations and criminal penalties.