information shall not be subject to disclosure for such time as it remains classified, except that such information may be disclosed to a court ex parte and in camera for purposes of judicial review under subsection (d). (4) Period of designation (A) In general A designation under paragraph (1) shall be effective for all purposes until revoked under paragraph (5) or (6) or set aside under subsection (d). (B) Review of designation upon petition (i) In general The Director shall review the designation of a foreign actor as a foreign intelligence threat to higher education under the procedures set forth in clauses (iii) and (iv) if the designated foreign actor files a petition for revocation within the petition period described in clause (ii). (ii) Petition period For purposes of clause (i)— (I) if the designated foreign actor has not previously filed a petition for revocation under this subparagraph, the petition period begins 2 years after the date on which the designation was made