Form of oath to be administered to the members of the Senate sitting in the trial of impeachments:
I solemnly swear (or affirm, as the case may be,) that in all things appertaining to the trial of the impeachment of , now pending, I will do impartial justice according to the Constitution and laws: so help me God.
Senate Impeachment Rules March 2, 1868
I do solemnly swear (or affirm) that I will support and defend the Constitution of the United States against all enemies, foreign and domestic;
… that I will bear true faith and allegiance to the same; that I take this obligation freely, without any mental reservation or purpose of evasion; and that I will well and faithfully discharge the duties of the office on which I am about to enter: So help me God.
SENATORS take an oath to defend the Constitution against all enemies, foreign and domestic…
NOT some CREATURE FROM HELL….!