Just as the Framers viewed the presidency as fiduciary, they understood the offenses that might disqualify the incumbent as breaches of that fiduciary duty. And that may well be why the discussion of Morris’s suggestion was so brief—the drafters knew what the words historically meant, because, as a House Judiciary Committee report noted in 1974, “at the time of the Constitutional Convention the phrase ‘high Crimes and Misdemeanors’ had been in use for over 400 years in impeachment proceedings in Parliament.” Certainly Alexander Hamilton knew by the time he penned “Federalist No. 65,” in which he explained that impeachment was for “those offenses which proceed from the misconduct of public men, or, in other words, from the abuse or violation of some public trust.”

What constitutes such an abuse or violation of trust is up to Congress to decide: First the House decides to bring impeachment charges, and then the Senate decides whether to convict on those charges. The process of impeachment by the House and removal by trial in the Senate is thus, in some ways, akin to indictment by a grand jury and trial by a petit jury. In other ways, it is quite different. As Laurence Tribe and Joshua Matz explain in their recent book on impeachment, “the Constitution explicitly states that Congress may not end a presidency unless the president has committed an impeachable offense. But nowhere does the Constitution state or otherwise imply that Congress must remove a president whenever that standard is met … In other words, it allows Congress to exercise judgment.” As Tribe and Matz argue, that judgment presents a “heavy burden,” and demands that Congress be “context-sensitive,” and achieve “an understanding of all relevant facts.” A president might breach his trust to the nation once in some small, inconsequential way and never repeat the misbehavior, and Congress could reasonably decide that the game is not worth the candle.

So the congressional judgment in the impeachment process necessarily includes the number and seriousness of offenses, and even extends well beyond those calculations. Congress must also, in particular, weigh the chances of recidivism; that possibility is precisely why the Constitution provides for removal as the principal sanction upon conviction on impeachment charges. As Charles Black Jr. explained in his classic 1974 book on impeachment, “We remove him principally because we fear he will do it again.” Or as George Mason put it during the Constitutional Convention, “Shall the man who has practised corruption … be suffered to escape punishment, by repeating his guilt?”