In this Feb. 6, 2019, file photo, Supreme Court Chief Justice John Roberts answers questions during an appearance at Belmont University in Nashville, Tenn. How a Senate impeachment trial of President Donald Trump would unfold is not yet known, but among the issues senators will have to decide are how long it lasts and whether witnesses are called. Presiding over the trial will be Roberts, who theoretically could issue key rulings on some of these questions. (AP Photo/Mark Humphrey) ** FILE **
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