FILE - In this June 21, 2017, file photo, former FBI Director Robert Mueller, the special counsel probing Russian interference in the 2016 election, departs Capitol Hill following a closed door meeting in Washington. While the country waits to see if President Donald Trump will sit for an interview with prosecutors, scores of people sucked into the investigation are waiting for their own signal from special counsel Mueller: whether he's done with them or not. (AP Photo/Andrew Harnik, File)
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