Nancy Pelosi ready to send articles of impeachment to Senate

The trial against President Donald Trump is expected to start next week, but it's still unclear whether witnesses will be called.
2:04 | 01/15/20

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Transcript for Nancy Pelosi ready to send articles of impeachment to Senate
There is news tonight in the impeachment showdown. Speaker Nancy Pelosi saying tomorrow is the day. The house will hold that vote to send the articles of impeachment over to the senate. And tonight, Mitch Mcconnell giving his first timeline of when the trial will start. So, will there been witnesses? And one thing the senators at the trial will not be allowed to have. Mary Bruce on the hill again tonight. Reporter: Tonight, Washington on the cusp of history. House speaker Nancy Pelosi announcing the wait is over. She is sending the articles of impeachment to the senate. So, madam speaker, is tomorrow the day? Yes, tomorrow is the day. Reporter: The white house has suggested Republicans should dismiss the trial before it even starts. But the Republican leader, Mitch Mcconnell, isn't interested. You clearly want to get this over sooner rather than later. Why not push to try and dismiss? There is little to no sentiment in the Republican conference for a motion to dismiss. Our members feel that we have an obligation to listen to the arguments. Reporter: The trial set to start next Tuesday. Still up in the air, the question of witnesses. Several key Republicans say they are interested in hearing from additional key players. Including John Bolton? Including John Bolton. Yes. He's someone who I would like to hear from. Reporter: But Mcconnell won't commit, saying if they do call witnesses, it would be up to a majority of the senate. 51 senators will decide who to call. So, let's get to Mary Bruce on the hill again tonight. And senator Mcconnell pointing out today, 51 senators will decide which witnesses to call in any senate trial. Of course, they haven't decided on witnesses. But seeming to imply this will go both ways. If the Democrats want witnesses, the Republicans could want witnesses too. I know you are learning about something else, too, what this trial could look like in other ways. Senators will have to abide by some pretty strict rules? Reporter: Well, David, this will not look like your average proceeding. All 100 senators will have to remain in their seats, silent, throughout the entire trial. And they are not going to be allowed to have any electronics, so, no cell phones or tablets. It's likely to be quite a challenge for many senators. David? Mary, thank you. And next tonight here, the new images emerging tonight of

This transcript has been automatically generated and may not be 100% accurate.

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