Article 2, Section 1, Clause 7
Alexander Hamilton, Federalist, no. 73, 492--9421 Mar. 1788
The third ingredient towards constituting the vigor of the executive authority is an adequate provision for its support. It is evident that without proper attention to this article, the separation of the executive from the legislative department would be merely nominal and nugatory. The Legislature, with a discretionary power over the salary and emoluments of the Chief Magistrate, could render him as obsequious to their will, as they might think proper to make him. They might in most cases either reduce him by famine, or tempt him by largesses, to surrender at discretion his judgment to their inclinations. These expressions taken in all the latitude of the terms would no doubt convey more than is intended. There are men who could neither be distressed nor won into a sacrifice of their duty; but this stern virtue is the growth of few soils: And in the main it will be found, that a power over a man's support is a power over his will. If it were necessary to confirm so plain a truth by facts, examples would not be wanting, even in this country, of the intimidation or seduction of the executive by the terrors, or allurements, of the pecuniary arrangements of the legislative body.
It is not easy therefore to commend too highly the judicious attention which has been paid to this subject in the proposed Constitution. It is there provided that "The President of the United States shall, at stated times, receive for his services a compensation, which shall neither be increased nor diminished, during the period for which he shall have been elected, and he shall not receive within that period any other emolument from the United States or any of them." It is impossible to imagine any provision which would have been more eligible than this. The Legislature on the appointment of a President is once for all to declare what shall be the compensation for his services during the time for which he shall have been elected. This done, they will have no power to alter it either by increase or diminution, till a new period of service by a new election commences. They can neither weaken his fortitude by operating upon his necessities; nor corrupt his integrity, by appealing to his avarice. Neither the Union nor any of its members will be at liberty to give, nor will he be at liberty to receive any other emolument, than that which may have been determined by the first act. He can of course have no pecuniary inducement to renounce or desert the independence intended for him by the Constitution.
Hamilton, Alexander; Madison, James; and Jay, John. The Federalist. Edited by Jacob E. Cooke. Middletown,
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