Alexander Hamilton on the pardoning power of the President, in Federalist Paper No. 74:
“He is also to be authorized to grant “reprieves and pardons for offenses against the United States, EXCEPT IN CASES OF IMPEACHMENT.” Humanity and good policy conspire to dictate, that the benign prerogative of pardoning should be as little as possible fettered or embarrassed. The criminal code of every country partakes so much of necessary severity, that without an easy access to exceptions in favor of unfortunate guilt, justice would wear a countenance too sanguinary and cruel. As the sense of responsibility is always strongest, in proportion as it is undivided, it may be inferred that a single man would be most ready to attend to the force of those motives which might plead for a mitigation of the rigor of the law, and least apt to yield to considerations which were calculated to shelter a fit object of its vengeance. The reflection that the fate of a fellow-creature depended on his sole fiat, would naturally inspire scrupulousness and caution; the dread of being accused of weakness or connivance, would beget equal circumspection, though of a different kind. On the other hand, as men generally derive confidence from their numbers, they might often encourage each other in an act of obduracy, and might be less sensible to the apprehension of suspicion or censure for an injudicious or affected clemency. On these accounts, one man appears to be a more eligible dispenser of the mercy of government, than a body of men.”