Supreme Court Chief Justice John Roberts administered the oath to senators, who were standing at their desks on the Senate floor with their right hands raised.

"Do you solemnly swear that in all things appertaining to the trial of the impeachment of Donald John Trump, president of the United States, now pending, you will do impartial justice according to the Constitution and laws, so help you god?" Roberts asked senators.

Members of the senate took an oath on Thursday to uphold "impartial justice" as's impeachment trial gets underway."He plans to return to Washington on Tuesday where he will be sworn in with no delay to the impeachment process," his office added.