The United States Senate officially opened the impeachment trial of President Donald Trump on Thursday. It marks only the third time the legislative body has held such a trial in U.S. history. Chief Justice John Roberts of the Supreme Court was sworn in to preside over the trial. He then asked all senators to raise their right hands to take an oath to “do impartial justice according to the Constitution and laws, so help you God?” The U.S. Constitution says the chief justice serves as the presiding officer in the trial. But only the 100 members of the Senate will pass judgement. Earlier in the day, Democrats from the House of Representatives led by Adam Schiff read the charges, or articles of impeachment, in the Republican-led Senate. “With the permission of the Senate, I will now read the articles of impeachment,” said Schiff.