Senate Homeland Security and Governmental Affairs Committee Chairman Gary Peters called their refusal to publicly testify a "shocking departure" that runs counter to 15 years of precedent.
CIA official Asif W. Rahman held top-secret security clearance and had access to sensitive information, the New York Times reported.
Security officials said separately that parcels that exploded at logistics depots in Europe were part of a test run for a Russian plot to trigger explosions on cargo flights to the United States.
The threats, which were deemed to be non-credible, caused two polling locations in Fulton County, Georgia, to be evacuated.
Many US schools step up security and choose not to serve as polling locations due to safety concerns, as federal agencies have limited response options.
Officials have been warning Americans about attempts to undermine the election with wrong information and have urged US voters to seek out credible information from reliable sources.
The Alas Chiricanas Flight 901 exploded shortly after takeoff from Colón, instantly killing everyone on board, including four Israelis and three Americans.
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