Nor does this proceeding in any way belong to that class of incidental resolutions which relate to the officers of the Senate, to their Chamber and other appurtenances, or to subjects of order and other matters of the like nature, in all which either House may lawfully proceed without any cooperation with the other or with the President. On the contrary, the whole phraseology and sense of the resolution seem to be judicial. Its essence, true character, and only practical effect are to be found in the conduct which it charges upon the President and in the judgment which it pronounces on that conduct. The resolution, therefore, though discussed and adopted by the Senate in its legislative capacity, is in its office and in all its characteristics essentially judicial. That the Senate possesses a high judicial power and that instances may occur in which the President of the United States will be amenable to it is undeniable; but under the provisions of the Constitution it would seem to be equally plain that neither the President nor any other officer can be rightfully subjected to the operation of the judicial power of the Senate except in the cases and under the forms prescribed by the Constitution. The Constitution declares that "the President, Vice-President, and all civil officers of the United States shall be removed from office on impeachment for and conviction of treason, bribery, or other high crimes and misdemeanors;" that the House of Representatives "shall have the sole power of impeachment;" that the Senate "shall have the sole power to try all impeachments;" that "when sitting for that purpose they shall be on oath or affirmation;" that "when the President of the United States is tried the Chief Justice shall preside;" that "no person shall be convicted without the concurrence of two-thirds of the members present," and that "judgment shall not extend further than to removal from office and disqualification to hold and enjoy any office of honor, trust, or profit under the United States."