From the Document: "In January 2017, in accordance with Presidential Policy Directive 21 (PPD-21), the Department of Homeland Security (DHS) designated the systems and assets used in elections as the Election Infrastructure Subsector (EIS) of the Government Facilities critical infrastructure sector. DHS defines critical infrastructure as 'the physical and cyber systems and assets that are so vital to the United States that their incapacity or destruction would have a debilitating impact on our physical or economic security or public health or safety.' The critical infrastructure designation was intended to help address some of the obstacles election stakeholders faced in responding to foreign interference in the 2016 elections, such as a lack of timely information sharing about threats to election systems. It gave DHS a new role in election security, authorizing it to help coordinate among and prioritize assistance to election security stakeholders. This In Focus provides an overview of the EIS. It describes the formation and development of the subsector and some of the ongoing challenges it faces."
CRS In Focus, IF11445
Congressional Research Service: https://crsreports.congress.gov/