and Nationality Act ( 8 U.S.C. 1253 ), the Secretary may not reduce the number to a level below 20 percent of the baseline visa number. (c) Waivers (1) National security waiver If the Secretary of State submits to Congress a written determination that significant national security interests of the United States require a waiver of the sanctions under subsection (b), the Secretary may waive any reduction below 80 percent of the baseline visa number. The Secretary of Homeland Security may not delegate the authority under this subsection. (2) Temporary exigent circumstances If the Secretary of State submits to Congress a written determination that temporary exigent circumstances require a waiver of the sanctions under subsection (b), the Secretary may waive any reduction below 80 percent of the baseline visa number during 6-month renewable periods. The Secretary of Homeland Security may not delegate the authority under this subsection. (d) Exemption The Secretary of Homeland Security, in consultation with the Secretary of State, may exempt a country from inclusion in a list under subsection (a)(2) if the total number of nonrepatriations outstanding is less than 10 for the preceding 3-year period. (e) Unauthorized visa issuance Any visa issued in violation of this section shall be void. (f) Notice If an alien who has been convicted of a criminal offense before a Federal or State court whose repatriation was refused or unreasonably delayed is to be released from detention by the Secretary of Homeland Security, the Secretary shall provide notice to the State and local law enforcement agency for the jurisdictions in which the alien is required to report or is to be released. When possible, and particularly in the case of violent crime, the Secretary shall make a reasonable effort to provide notice of such release to any crime victims and their immediate family members. (g) Definitions For purposes of this section: (1) Refused or unreasonably delayed A country is deemed to have refused or unreasonably delayed the