This, however, was to encounter far greater evils than it avoided. If paid by their States, the members of the national legislature would not only receive different compensations, but they would be directly subjected to the prejudices, caprices, and political purposes of the State legislatures. Whatever theory might be maintained with respect to the relations between the representatives, in either branch, and the State in which they were chosen, or the people of the States, to subject one class of public servants to the power of another class could not fail to produce the most mischievous consequences. A large majority of the States, therefore, decided upon payment out of the national treasury,[186] and it was finally determined that the rate of compensation should not be fixed by the Constitution, but should be left to be ascertained by law.[187]
Among the separate functions assigned by the Constitution to the houses of Congress are those of presenting and trying impeachments. An impeachment, in the report of the committee of detail, was treated as an ordinary judicial proceeding, and was placed within the jurisdiction of the Supreme Court. That this was not in all respects a suitable provision, will appear from the following considerations. Although an impeachment may involve an inquiry whether a crime against any positive law has been committed, yet it is not necessarily a trial for crime; nor is there any necessity, in the case of crimes committed by public officers, for the institution of any special proceeding for the infliction of the punishment prescribed by the laws, since they, like all other persons, are amenable to the ordinary jurisdiction of the courts of justice, in respect of offences against positive law. The purposes of an impeachment lie wholly beyond the penalties of the statute or the customary law. The object of the proceeding is to ascertain whether cause exists for removing a public officer from office. Such a cause may be found in the fact, that, either in the discharge of his office, or aside from its functions, he has violated a law, or committed what is technically denominated a crime. But a cause for removal from office may exist, where no offence against positive law has been committed, as where the individual has, from immorality or imbecility or maleadministration, become unfit to exercise the office. The rules by which an impeachment is to be determined are therefore peculiar, and are not fully embraced by those principles or provisions of law which courts of ordinary jurisdiction are required to administer.