section 803. (b) Agency review (1) In general Not later than 180 days after the date of the enactment of the Damon Paul Nelson and Matthew Young Pollard Intelligence Authorization Act for Fiscal Years 2018, 2019, and 2020 , each head of an agency shall, consistent with the interest of national security, establish and publish in the Federal Register a process by which a covered person to whom eligibility for access to classified information was denied or revoked by the agency can appeal that denial or revocation within the agency. (2) Elements The process required by paragraph (1) shall include the following: (A) In the case of a covered person to whom eligibility for access to classified information is denied or revoked by an agency, the following: (i) The head of the agency shall provide the covered person with a written— (I) detailed explanation of the basis for the denial or revocation as the head of the agency determines is consistent with the interests of national security and as permitted by other applicable provisions of law