Misdemeanors.
A Member of Congress is not a civil officer within the meaning of this section; nor is a private citizen subject to impeachment;[478] but resignation of an officer does not give immunity from impeachment for acts committed while in office.[479]
"HIGH CRIMES AND MISDEMEANORS"
Most of the States have drafted their constitutional provisions on this subject in similar language. As there is no enumeration of offenses comprised under the last two categories, no little difficulty has been experienced in defining offenses in such a way that they fall within the meaning of the constitutional provisions. But impeachable offenses were not defined in England, and it was not the intention that the Constitution should attempt an enumeration of crimes or offenses for which an impeachment would lie. Treason and bribery have always been offenses whose nature was clearly understood. Other high crimes and misdemeanors which might be made causes for the impeachment of civil officers were those which embraced any misbehavior while in office. Madison, whose objection led to the insertion of the more definite phrase high crimes and misdemeanors, was the strongest advocate of a broad construction of the impeachment power. He argued that incapacity, negligence, or perfidy of the Chief Magistrate should be ground for impeachment.[480] Again, in discussing the President's power of removal, he maintained that the wanton removal from office of meritorious officers would be an act of maladministration, and would render the President liable to impeachment.[481] Hamilton thought the proceeding could "never be tied down by such strict rules, either in the delineation of the offense by the prosecutors, or in the construction of it by the judges, as in common cases serve to limit the discretion of the courts in favor of personal security."[482]
THE CHASE IMPEACHMENT
The above relatively flexible conception of "high crimes and misdemeanors" was, however, early replaced by a much more rigid one in consequence of Jefferson's efforts to diminish the importance of the Supreme Court, the first step in which enterprise was the impeachment in 1805 of Justice Samuel Chase. The theory of Chase's enemies was given its extremest expression by Jefferson's henchman, Senator Giles of Virginia, as follows: "Impeachment is nothing more than an enquiry, by the two Houses of Congress, whether the office of any public man might not be better filled by another. * * * The power of impeachment was given without limitation to the House of Representatives; and the power of trying impeachments was given equally without limitation to the Senate; * * * A trial and removal of a judge upon impeachment need not imply any criminality or corruption in him. * * * [but] was nothing more than a declaration of Congress to this effect: You hold dangerous opinions, and if you are suffered to carry them into effect you will work the destruction of the nation. We want your offices, for the purpose of giving them to men who will fill them better."[483] To this theory Chase's counsel opposed the proposition that "high crimes and misdemeanors" meant offenses indictable at common law; and Chase's acquittal went far to affix this reading to the phrase till after the War between the States.
THE JOHNSON IMPEACHMENT