Foreign adversaries, including Russia, China, and Iran, are intensifying their efforts to influence the US election as Election Day approaches, according to a report by Microsoft. Russian operatives are using fake videos to smear Vice President Kamala Harris' campaign, while Chinese-linked social media campaigns are targeting down-ballot Republicans critical of China. Iranian actors, who allegedly sent intimidating emails to US voters in 2020, are surveying election-related websites and media outlets, raising concerns of another scheme. The report warns that the worst influence efforts may be yet to come, as foreign efforts to influence voters raise concerns in a tight election.