Article II of the Constitution gives the president broad and unreviewable power to grant "Reprieves and Pardons" for all offenses against the United States. The Supreme Court has ruled that the pardon power is granted "[t]o the [president] . . ., and it is granted without limit" (United States v. Klein). Justice Oliver Wendell Holmes declared that "[a] pardon . . . is . . . the determination of the ultimate authority that the public welfare will be better served by [the pardon] . . ." (Biddle v. Perovich). A president may conclude a pardon or commutation is warranted for several reasons: the desire to restore full citizenship rights, including voting, to people who have served their sentences and lived within the law since; a belief that a sentence was excessive or unjust; personal circumstances that warrant compassion; or other unique circumstances.