Details of the charges - including who they are against - have not been made public.
The indictment, CNN reported, was sealed, and it was unknown who was being charged, and what the charges were.
A federal grand jury approved the first charges filed by special counsel Robert Mueller, according to an exclusive CNN report.
The timing of the CNN exclusive is curious, as it comes just hours after Fox News published a story entitled, "Mueller facing new Republican pressure to resign in Russian Federation probe", quoting Rep. Trent Franks (R-Ariz.), who reiterated his call for Mueller to step down, and New Jersey Gov. Chris Christie, a former federal prosecutor, who'd gone on "Fox & Friends" on Friday morning to call for Mueller to step aside because of a conflict of interest.
Trump was apparently referring in his tweets to revelations last week that Clinton's campaign and the Democratic National Committee had paid for research that was included in a dossier made public in January by BuzzFeed that contained salacious claims about connections between Trump, his associates and Russian Federation.
The Republican-controlled Congress and the president have twice failed to repeal and replace the ACA, yet Trump has previously claimed it was "virtually dead" - and falsely added that "there's no such thing as Obamacare anymore".More news: Pitch tampering row: MCA curator suspended pending inquiry
Last year, the Comey-led investigation secured approval from the secret court that oversees the Foreign Intelligence Surveillance Act to monitor the communications of Manafort, as well as former Trump campaign adviser Carter Page, as part of the investigation into Russian meddling.
President Trump on Sunday said the lack of investigation into the Clinton campaign spending a reported $12 million on a dossier crafted during the 2016 presidential race to smear him has sparked unprecedented "anger and unity" among fellow Republicans.
The president tweeted after South Carolina GOP Rep. Trey Gowdy, chairman of the House Oversight committee, told "Fox News Sunday" that his concerns about Hillary Clinton's 2016 presidential campaign purportedly paying a law firm at least $10 million for the dossier, which was to be used as Trump opposition research.
Mueller also has investigated Michael Flynn, an adviser to Trump's campaign and later his national security adviser.
Mueller was the Federal Bureau of Investigation director while the FBI was investigating a subsidiary of Russia's state-owned nuclear energy company, Rosatom.