Facebook has not directly linked the efforts to Russia, the Times reported, thought it cited two anonymous sources that said Russia was "possibly" involved.
The election influence campaign involves dozens of inauthentic Facebook accounts and pages, the report says. Facebook reportedly told lawmakers on Capitol Hill about its findings this week. The company has scheduled a briefing with the media at 10 am PT on Tuesday, during which it is expected to publicly announced the findings.
Just last week Facebook refused to answer questions about whether it had detected any such efforts to influence or interfere in the midterm elections.
Facebook, which has more than 2 billion members worldwide, has come under increased scrutiny following revelations that its social network was used to spread misinformation during the 2016 US presidential election, as well as other important elections and referendums, such as the "Brexit" campaign in Britain.