Supporting would be claiming King Charles 3 is not an enemy who is hostile to the the white gentile citizens of the United States
In regards to the question of if it is treason for a person labeled as a United States citizen to support the British Monarchy
If a congress person uses their speech to make an allegiance with the British Royal family and support them in a war against Germany that is not in the best interest of the United States than that is providing aid and comfort to the enemy and is treason
No matter where anyone says King Charles 3 is not evil they are providing aid to the enemy in it's psychological warfare operations against United States citizens whether in private or public as a citizen or as a government official
If a person says King Charles 3 should not be punished for crimes against humanity then they are making King Charles 3 feel more comfortable and aiding King Charles 3 in psychological warfare against United States citizens
Overruled, all kings are enemies of the whites. Except 1