In his Senate testimony on June 8, fired FBI Director James Comey was asked whether Donald Trump obstructed justice by pressuring him to drop an investigation into former national security adviser Michael Flynn. Comey, as he did many times during the hearing, referred senators to Robert Mueller, the former FBI director and current special counsel, saying it was now his job to sort it all out. As special counsel, Mueller is investigating any links or coordination between the Russian government and the Trump campaign. He is vested with a unique set of powers, the extent of which won't be clear until he attempts to exercise them. Mueller has the traditional tools of a federal prosecutor: He can issue subpoenas, pull people in front of grand juries, and bring criminal charges. In theory, he can interrogate the president, though it's unclear whether Trump would willingly submit. Mueller can also seek to expand his probe beyond the original mandate into places he believes are relevant.
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