There was a multi-year government report indicating that "the Russian government 'interfered in the 2016 presidential election in sweeping and systematic fashion' and 'violated U.S. criminal law'."
Source and further reading if desired: https://en.wikipedia.org/wiki/Mueller_report#Russian_interfe...
The Justice Department under former Attorney General Bill Barr tried to determine who had leaked to the reporter, Devlin Barrett, because the information he published was accurate and classified: https://www.washingtonpost.com/national-security/washington-...
> Russian intelligence services' assault on the integrity of the 2016 U.S. electoral process[,] and Trump and his associates' participation in and enabling of this Russian activity, represents one of the single most grave counterintelligence threats to American national security in the modern era.
was also entirely fabricated by the Clinton campaign?