CNN reported Friday night that a federal grand jury has reportedly approved the first charges in Mueller's probe. A person or people could be taken into custody as early as Monday, according to CNN and the Wall Street Journal.
The indictment is now under seal but is expected to become public as early as Monday (Oct. 30).
Mueller, a former Federal Bureau of Investigation director, was given sweeping power in May to investigate Russian interference in the 2016 presidential campaign.
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Top attorneys for Mueller's team were seen entering the courtroom where the grand jury meets on Friday, and a lot of activity was witnessed by reporters on the scene, but no announcements were made, according to CNN.
Trump has repeatedly denied any accusations of wrong doing, characterizing the numerous investigation into Russian interference in the election and possible collusion by Trump or his associates as little more than a "witch hunt".
Mueller was appointed by Deputy Attorney General Rod Rosenstein in May to oversee the investigation.
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Mueller's investigation also includes an effort to determine whether Trump or any of his aides tried to obstruct justice.
Mueller served as director of the Federal Bureau of Investigation from 2001 to 2013.
The Kremlin has denied the allegations.
It is unclear what the charges are but it will all be revealed on Monday.
Tucker Carlson of Fox News reported on Wednesday that sources told him that the Podesta brothers and Manafort were a main focus of Mueller's investigation.
Mueller has wide latitude to examine matters arising from the investigation, and he has also been looking into any collusion by anyone associated with the Trump campaign with Russian Federation.