Under what condition may a President issue a reprieve?

A President may issue a reprieve specifically to postpone a legal sentence, which provides temporary relief from punishment. This power is part of the broader clemency powers granted to the President under Article II, Section 2 of the U.S. Constitution. When a reprieve is granted, it effectively delays the enforcement of a court's judgment or sentence, allowing time for new evidence, legal reconsideration, or other factors to potentially influence the outcome of the punishment without completely vacating or altering the original judgment.

The other options do not align with the specific nature of a reprieve. Granting a full pardon involves completely absolving someone from legal consequences, which is different from merely postponing a sentence. Denying amnesty is not a function of a reprieve, as amnesty involves forgiveness for a group of offenses rather than individual cases. Suspending Congressional actions does not fall under the scope of a President's clemency powers and does not relate to legal sentences or punishment.