Robert Mueller is reportedly just getting warmed up

Special Counsel Robert Mueller's office announced Friday the indictment of 13 Russians for meddling in the 2016 election. But that may just be the beginning.

Bloomberg Politics reports that Mueller and the FBI are not done probing possible collusion between President Trump's campaign and Russian actors during the election. A source who spoke to Bloomberg said that Friday's indictments — which were the first interference-related charges to result from Mueller's probe — were only "a limited slice of a comprehensive investigation."

Friday's indictment noted that those associated with the Trump campaign who came into contact with the Russian defendants were "unwitting" victims of Russian trickery. But Bloomberg warns that this does not preclude the possibility that Mueller will later charge other Americans for consciously working with Russian actors to influence the election. The collusion investigation "is expected to continue for months," Bloomberg's source says.

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On top of that, Mueller is still reportedly probing the possibility that Trump tried to obstruct justice as the Department of Justice's investigation into Russian meddling proceeded. Observers have pointed to Trump's firing of former FBI Director James Comey last May, as well as reports last month that Trump once ordered the firing of Mueller himself, as evidence of potential obstruction.

Shortly after news of the indictments broke, the president proclaimed on Twitter: "The Trump campaign did nothing wrong — no collusion!" Trump has long claimed that any allegations of Russian interference in the election are a hoax cooked up by Democrats.