China, Russia and Iran are among countries seeking to influence the US presidential elections this year, William Evanina, Head of the National Counterintelligence and Security Center (NCSC) said.
A statement issued by the director of US counterintelligence said foreign states were using “covert and overt influence measures” to sway the vote.
It said China did not want President Donald Trump’s re-election while Russia wanted to hurt Democrat Joe Biden.
Intelligence chiefs accuse Russia of interfering in the 2016 election. They say Russia wanted to help boost Mr Trump’s campaign, including by spreading disinformation online. Russia has denied the allegations, BBC reported.