The House of Representatives votes to impeach President Trump for a second time. What happens next?

Three journalists take us behind-the-scenes of the third impeachment of a President in American history.

The Senate finds President Trump not guilty on both articles of impeachment.

The Senate hears closing arguments as voting begins in the Iowa caucuses.

After a failed vote on witnesses, a new timeline emerges for an end to the trial.

The Senate votes on calling witnesses, signaling a possible end to the Senate trial.

The House Managers and President Trump’s defense team take questions from Senators.

New allegations from John Bolton are overshadowing the President’s impeachment defense.

Behind the scenes with three House managers making impeachment history.

House managers are arguing their case. Can they persuade Senators to side with them on the question of witnesses?

The Senate made some unexpected changes to trial rules on Tuesday.

The Senate trial is officially underway, with the Chief Justice and members of the Senate sworn in this week. But in a last-minute addition to the evidence, an associate of Rudy Giuliani gave the House of Representatives documents that shed new light on the Ukrainian pressure campaign. Parnas, who is out on bond on federal campaign finance charges, also spoke publicly this week for the first time about his involvement in the scheme. Josh Lederman, national political reporter for NBC News, explains what we learned from Parnas, the credibility of his allegations, and how this new information could influence the Senate trial. Have a question about the Senate trial or something else impeachment-related? Email our host Steve Kornacki at articletwopodcast@gmail.com. For a transcript, please visit https://www.nbcnews.com/articletwo. Further ReadingKey things we learned from Lev Parnas' revealing MSNBC interviewGiuliani associate Parnas says Trump 'knew exactly what was going onIndicted Giuliani associate Parnas says Trump ordered Ukraine ambassador's firing several times before recall

The articles of impeachment are now in the hands of the Senate.

Lawmakers get ready for an impeachment trial in the Senate.

Supreme Court Chief Justice John Roberts will preside over the Senate impeachment trial. Here’s what that will look like.

Former Congressman Bill McCollum looks back at his experience as a house manager in the impeachment trial of President Bill Clinton.

Congress is balancing next steps with impeachment and Iran.

Every President takes the oath of office, but what happens when it’s tested?

Here's what to expect from an impeachment trial in the Senate.

Rudy Giuliani is relying on former Ukranian officials to clear the President of wrongdoing.