Presidential Policy Directive (PPD)-19
PPD-19, Protecting Whistleblowers with Access to Classified Information, signed by President Obama on October 10, 2012, provided the first executive branch protections for IC whistleblowers. PPD-19 specifically protects some employees in the IC—but specifically excludes members of the Armed Forces—with access to classified information from personnel
a disclosure of information by the employee to a supervisor in the employee’s direct chain of command up to and including the head of the employing agency, to the Inspector General of the employing agency or Intelligence Community Element, to the Director of National Intelligence, to the Inspector General of the Intelligence Community, or to an employee designated by any of the above officials for the purpose of receiving such disclosures, that the employee reasonably believes evidences (i) a violation of any law, rule, or regulation; or (ii) gross mismanagement, a gross waste of funds, an abuse of authority, or a substantial and specific danger to public health and safety.
https://fas.org/sgp/crs/intel/R45345.pdf