If a consular officer denies a visa application, there is no appeal. Still, there may be several ways to challenge a visa denial, such as requesting reconsideration, supervisorial review, or an advisory opinion, or resubmitting the application. If a visa denial cannot be overcome, it may be possible to request a “waiver.” A waiver is somewhat analogous to a pardon in criminal law, in that a waiver forgives an ineligibility, allowing visa issuance.