The only plausible source for a clarification of proper recourse to impeachment is the chief justice, John Roberts, as the only impartial person in sight.
Sen.Susan Collins said that Bolton’s statements about President Trump's involvement with Ukraine “strengthens the case for witnesses” in the impeachment trial.
The historical evidence suggests that a statutory violation isn’t required for impeachment. It also suggests President Trump shouldn’t be removed from office.
Schiff (D., Calif.) pushed back on the claim that the 2020 election makes any effort to hold President Trump accountable through impeachment unnecessary.