Less than 24 hours after President Donald Trump commuted the prison sentence of former campaign aide Roger Stone, former Department of Justice special counsel Robert S. Mueller III defended the investigation into Russian meddling and said Stone “remains a convicted felon, and rightfully so.”

Mueller, who led the federal investigation into Russian interference in the 2016 U.S. presidential election, pushed back against claims that the inquiry was a “witch hunt.” In an editorial published by the Washington Post, Mueller said he felt “compelled to respond both to broad claims that our investigation was illegitimate and our motives were improper.”

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