The impeachment of President Donald Trump is the Senate's challenge now.
Directed by the Constitution, House officials and prosecutors somberly carried the articles through the dimly lit Capitol to the Senate on Wednesday evening, triggering a trial unlike any since President Bill Clinton's in 1999. He was acquitted.
Look Thursday for a series of striking ceremonial matters to set up the Senate as a court of impeachment. Oaths will be taken. An oath book will be signed. And the seven House prosecutors, called managers, appointed by Speaker Nancy Pelosi will make an appearance in the well of the Senate to present the articles.
Then the senators will be commanded to surrender their phones, pay attention and not talk — a whole other level of challenge, especially for the four Democrats running for president ahead of the Feb. 3 Iowa caucuses.
What to watch when the Senate opens for impeachment business:
At noon Thursday, the seven House managers will again cross the Capitol and be escorted into the well of the Senate, this time to formally present the articles of impeachment. They charge Trump with abuse of power by pressuring Ukraine to help him politically and obstructing Congress's probe into what happened.
The prosecution team is led by House Intelligence Committee Chairman Adam Schiff of California and Judiciary Committee Chairman Jerrold Nadler of New York, who oversaw the impeachment investigation and hearings. The others are Reps. Zoe Lofgren of California, Hakeem Jeffries of New York, Val Demings of Florida, Jason Crow of Colorado and Sylvia Garcia of Texas.
All have backgrounds in the law. Their challenge is to persuade four Republicans to join all Senate Democrats in demanding that the trial include new documents and witnesses most in the GOP senators would like to avoid. Even that modest goal could prove difficult.