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Robert Mueller will oversee the Russia investigation. Here’s a look at his background.
USA TODAY

On May 17, the Justice Department announced the appointment of former FBI director Robert S. Mueller III as special counsel to investigate any possible collusion between the Trump campaign and the Russian government’s efforts to influence the 2016 presidential election.

Trump responded by calling the investigation a “witch hunt.”

At a May 18 press conference, Trump said: “Well, I respect the move, but the entire thing has been a witch hunt. And there is no collusion between certainly myself and my campaign — but I can always speak for myself — and the Russians, zero.”

Deputy Attorney General Rod Rosenstein made the decision to appoint a special counsel just days after Trump fired FBI Director James Comey. Comey told Congress on March 20 that the FBI had opened an investigation last July into “the Russian government’s efforts to interfere in the 2016 presidential election, and that includes investigating the nature of any links between individuals associated with the Trump campaign and the Russian government and whether there was any coordination between the campaign and Russia’s efforts.”

Amid ongoing investigations by the FBI and House and Senate intelligence committees, what exactly does the appointment of a special counsel mean? Here we answer some questions that readers may have.

Who appoints a special counsel?

The appointment of a special counsel typically is the decision of the U.S. attorney general. But in this case, Attorney General Jeff Sessions recused himself from the Russia inquiry after it was revealed that he had met twice with Russian Ambassador Sergey Kislyak during the presidential campaign and did not disclose the meetings during his Senate confirmation…