Associated Press

Officials say the U.S. election system is so secure that no foreign nation could alter the results at a scale necessary to change the outcome. Nevertheless, authoritarian adversaries have leveraged disinformation and cyberespionage to target campaigns and voters while stoking distrust and discord.

Russia is the most active and sophisticated nation working to manipulate the U.S. election, using fake websites, state-controlled media and unwitting Americans to spread misleading and polarizing content aimed at undermining confidence in elections.