William Evanina, chief of the National Counterintelligence and Security Center (NCSC), said that with just over 100 days to the election, it was "imperative" his agency share with voters some of the information about possible interference that U.S. spies have given to campaigns and legislators.
The American public has a role to play in securing the election, particularly in maintaining vigilance against foreign influence," said Evanina, who directs the counterintelligence branch of the U.S. Office the Director of National Intelligence.
At the most basic level, we encourage Americans to consume information with a critical eye, check out sources before reposting or spreading messages, practice good cyber hygiene and media literacy, and report suspicious election-related activity to authorities," he added in a written statement.
A January 2017 U.S. intelligence community assessment found Russia meddled in the 2016 election and its goals included aiding U.S. President Donald Trump, who has cast doubt on whether Moscow interfered in that vote.
Given the complexity of U.S. vote counting and auditing systems, Evanina said it would be "extraordinarily difficult for foreign adversaries to broadly disrupt or change vote tallies without detection."
However, Evanina said U.S. spy agencies now see foreign adversaries trying to compromise U.S. political campaigns and candidates, as well as elections infrastructure. He said foreign nations are trying to influence U.S. voters via social and traditional media, using issues including the coronavirus pandemic and domestic protests as disinformation fodder.
Evanina said his agency was mainly concerned with interference by China, Russia and Iran, though other unnamed countries and non-state actors "could also do harm to our electoral process.