CNN News:特朗普弹劾案在参议院开审 美首席大法官担任主审

With the impeachment trial of U.S. President Donald Trump going on right now in the Senate, we're taking a look at the role of the person who's presiding over that trial Chief Justice John Roberts. His official title is Chief Justice of the United States. He's the highest ranking judge in America. And though his main job is leading the Supreme Court, he's got a new responsibility in the Senate's impeachment trial of presiding over that as well. It's required by the U.S. Constitution.

In fact, the only time the phrase Chief Justice appears in America's governing document is when it describes his role in the Senate's impeachment trials of presidents. Chief Justice Roberts power in that trial is limited. Any rulings he makes could be voted down and overwritten by Senators. And while it's unknown exactly how much of a role he'll play in the trial something he said during his confirmation hearing in 2005 could give us a clue. He compared judges to umpires saying they don't make the rules, they apply them.
CHIEF JUSTICE JOHN ROBERTS: You will remember that it's my job to call balls and strikes and not to pitch or bat.
AZUZ: Yesterday he walked across the street from the U.S. Supreme Court to the U.S. Senate to take on his new and somewhat different responsibility.