Chief Justice John Roberts sworn in by Senate President Pro Tempore Chuck Grassley
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An impeachment trial is not a criminal trial, but that does mean that the Senate may utilize procedures that violate due process. To prevent that from happening, the chief justice plays a critical role in ensuring basic fairness for everyone.
It means that he should carry out his duties with the goal of providing justice to the president, the House, the Senate, and the American people, not feeling bound by the wishes of the parties.