Alexander Hamilton explains the importance of the Senate’s “advise and consent” power, arguing for its necessity as a check on the executive branch.

To the People of the State of New York:

THE President is “to NOMINATE, and, by and with the advice and consent of the Senate, to appoint ambassadors, other public ministers and consuls, judges of the Supreme Court, and all other officers of the United States whose appointments are not otherwise provided for in the Constitution. But the Congress may by law vest the appointment of such inferior officers as they think proper, in the President alone, or in the courts of law, or in the heads of departments. The President shall have power to fill up ALL VACANCIES which may happen DURING THE RECESS OF THE SENATE, by granting commissions which shall EXPIRE at the end of their next session.”

It has been observed in a former paper, that “the true test of a good government is its aptitude and tendency to produce a good administration.” If the justness of this observation be admitted, the mode of appointing the officers of the United States contained in the foregoing clauses, must, when examined, be allowed to be entitled to particular commendation. It is not easy to conceive a plan better calculated than this to promote a judicious choice of men for filling the offices of the Union; and it will not need proof, that on this point must essentially depend the character of its administration.

To what purpose then require the co-​operation of the Senate? I answer, that the necessity of their concurrence would have a powerful, though, in general, a silent operation. It would be an excellent check upon a spirit of favoritism in the President, and would tend greatly to prevent the appointment of unfit characters from State prejudice, from family connection, from personal attachment, or from a view to popularity. In addition to this, it would be an efficacious source of stability in the administration.

It will readily be comprehended, that a man who had himself the sole disposition of offices, would be governed much more by his private inclinations and interests, than when he was bound to submit the propriety of his choice to the discussion and determination of a different and independent body, and that body an entier branch of the legislature. The possibility of rejection would be a strong motive to care in proposing. The danger to his own reputation, and, in the case of an elective magistrate, to his political existence, from betraying a spirit of favoritism, or an unbecoming pursuit of popularity, to the observation of a body whose opinion would have great weight in forming that of the public, could not fail to operate as a barrier to the one and to the other. He would be both ashamed and afraid to bring forward, for the most distinguished or lucrative stations, candidates who had no other merit than that of coming from the same State to which he particularly belonged, or of being in some way or other personally allied to him, or of possessing the necessary insignificance and pliancy to render them the obsequious instruments of his pleasure.

To this reasoning it has been objected that the President, by the influence of the power of nomination, may secure the complaisance of the Senate to his views. This supposition of universal venalty in human nature is little less an error in political reasoning, than the supposition of universal rectitude. The institution of delegated power implies, that there is a portion of virtue and honor among mankind, which may be a reasonable foundation of confidence; and experience justifies the theory. It has been found to exist in the most corrupt periods of the most corrupt governments. The venalty of the British House of Commons has been long a topic of accusation against that body, in the country to which they belong as well as in this; and it cannot be doubted that the charge is, to a considerable extent, well founded. But it is as little to be doubted, that there is always a large proportion of the body, which consists of independent and public-​spirited men, who have an influential weight in the councils of the nation. Hence it is (the present reign not excepted) that the sense of that body is often seen to control the inclinations of the monarch, both with regard to men and to measures. Though it might therefore be allowable to suppose that the Executive might occasionally influence some individuals in the Senate, yet the supposition, that he could in general purchase the integrity of the whole body, would be forced and improbable. A man disposed to view human nature as it is, without either flattering its virtues or exaggerating its vices, will see sufficient ground of confidence in the probity of the Senate, to rest satisfied, not only that it will be impracticable to the Executive to corrupt or seduce a majority of its members, but that the necessity of its co-​operation, in the business of appointments, will be a considerable and salutary restraint upon the conduct of that magistrate. Nor is the integrity of the Senate the only reliance. The Constitution has provided some important guards against the danger of executive influence upon the legislative body: it declares that “No senator or representative shall during the time FOR WHICH HE WAS ELECTED, be appointed to any civil office under the United States, which shall have been created, or the emoluments whereof shall have been increased, during such time; and no person, holding any office under the United States, shall be a member of either house during his continuance in office.”

PUBLIUS.