You were elected to put a check on Trump, so do what you were elected to do, put a check on Trump. You took an oath to protect America, against all enemies,
foreign Putin and domestic Trump. Uphold your oath of office.
“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.” Oath of Office