Presidential Policy Directive 21 (PPD-21)

[Presidential Directive that] aims to clarify roles and responsibilities across the Federal Government and establish a more effective partnership with owners and operators and State, local, tribal and territorial entities to enhance the security and resilience of critical infrastructure. (Source: PPD-21, 2013).

Source: Starting Point: U.S. Election Systems as Critical Infrastructure, U.S. Election Assistance Commission, https://www.eac.gov/sites/default/files/eac_assets/1/6/starting_point_us_election_systems_as_Critical_Infrastructure.pdf