A United States official pointed the finger at Iran over emails meant to intimidate American voters and sow unrest in multiple states.
John Ratcliffe, a political appointee who is the government's top intelligence official, accused both Tehran and Russia of activities meant to interfere in the upcoming presidential election.
"These actions are desperate attempts by desperate adversaries," he said at a rare news conference just two weeks before the election. Ratcliffe is a former Republican congressman from Texas.
While state-backed Russian hackers are known to have infiltrated US election infrastructure in 2016, there is no evidence that Iran has ever done so. Cybersecurity experts consider it to be a second-rate actor in online espionage.
Along with FBI Director Chris Wray, Ratcliffe insisted the US would impose costs on any foreign countries that interfere in the election.