The investigation, which began past year, is seeking to determine Russia's involvement in the 2016 presidential election, as well as if anyone in Trump's campaign colluded with the Kremlin. Details of the charges - including who they are against - have not been made public.
As of Saturday morning, it was unclear what exactly the charges were or who they'd been filed against as they were sealed under a federal judge's order.
Renato Mariotti says the most obvious potential targets are former national security advisor Michael Flynn and President Trump's former campaign manager, Paul Manafort, whose Virginia home was raided by the Federal Bureau of Investigation in July.
A spokesman for Mueller's office did not immediately return Bustle's request for comment.
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Mueller was appointed in May to investigate whether the Trump campaign had colluded with the Russian government during the election.
Authorities were preparing to take anyone charged into custody on Monday, CNN reported, citing sources briefed on the matter.
Later this summer, Mueller convened a federal grand jury in Washington, DC, in the case. Other incidents that have come up in the investigation are meetings between former Russian Ambassador to the US Sergey Kislyak with Trump's son-in-law and adviser Jared Kushner and former National Security Adviser Michael Flynn.
President Trump had been repeatedly frustrated by the investigation since entering office, calling the probe a "witch hunt" and denying any collusion with Moscow. By June, Trump himself was reportedly under investigation for obstruction of justice.