Federal Election Commission: Membership and Policymaking Quorum, in Brief [Updated May 7, 2020] [open pdf - 1MB]
From the Summary: "The Federal Election Commission (FEC) is the nation's civil campaign finance regulator. The agency ensures that campaign fundraising and spending is publicly reported; that those regulated by the Federal Election Campaign Act (FECA) and by commission regulations comply and have access to guidance; and that publicly financed presidential campaigns receive funding. [...] This CRS report briefly explains the kinds of actions that FECA precludes when a quorum is not possible because fewer than four FEC members are in office. This episode marks the second quorum loss in the agency's history--the first occurred for six months in 2008--leaving the commission unable to hold hearings, issue rules, and enforce campaign finance law and regulation. The agency remains open for business with remaining commissioners and regular staff, but new policy decisions and enforcement actions cannot be advanced or finalized."
CRS Report for Congress, R45160
Congressional Research Service: https://crsreports.congress.gov/