‘No choice but to act’ on impeachment, Pelosi says

House Speaker Nancy Pelosi announced Thursday that she has instructed House Democrats to draw up articles of impeachment for President Donald Trump.
2:58 | 12/06/19

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Transcript for ‘No choice but to act’ on impeachment, Pelosi says
And next, to the historic next step in this impeachment showdown. House speaker Nancy Pelosi saying today, the president leaves congress, quote, no choice. Telling the house to move to impeach the president. The president calling it a big fat hoax. And after the speaker addressed the cameras today, a reporter shouting a question. She stopped, fired back and then she returned to the podium. ABC's Mary Bruce on what played out today. She's on the hill tonight. Reporter: Today, the historic announcement from speaker Nancy Pelosi, after two months of investigation, the house will move to impeach president trump. Today, I am asking our chairmen to proceed with articles of impeachment. Reporter: It's a step the speaker has resisted for months. Our democracy is what is at stake. The president leaves us no choice but to act. Reporter: We asked Pelosi what changed her mind. Was there an "Ah ha" moment for you personally, a piece of evidence or testimony that swayed you now to take this step? The facts of the Ukraine situation just changed everything. Asking a president of another country to make an announcement that he was investigating the president's political opponent and withholding military assistance that was voted by the congress of the United States. Reporter: At the white house, our Cecilia Vega pressing the president. Are you worried, sir, about the stain impeachment might have on your legacy? No, not at all. It's a hoax. Reporter: Just 24 hours ago, Republicans insisted Democrats want to impeach trump simply because they don't like him. As she walked off today, a reporter asked Pelosi if this is personal. Do you hate the president, madam speaker? I don't hate anybody. I was raised in a catholic house and we don't hate anybody. Not anybody in the world. So don't accuse me. I did not accuse you. Yes, you did. I asked a question. Representative Collins suggested yesterday the Democrats are doing this simply because they don't like the guy. That has nothing to do with -- let me just say this. I think it's an important point. I think the president is a coward when it comes to helping our kids who are afraid of gun violence. Reporter: Pelosi listed issues where she and the president clash, but insisted none of them have to too with impeachment. This is about the constitution of the united States. Didn't hate anyone. So don't mess with me when it comes to words like that. So, let's get to Mary Bruce with us live on the hill Mary, president trump tweeting tonight if congress is going to impeach him, they should do it now so he can have, quote, a fair trial. Of course, in the republican-controlled senate. And this is all moving very quickly. Reporter: David, this is progressing at a rapid pace. On Monday, Democrats who are leading this investigation will present their evidence before the committee that is now drafting these articles of impeachment. And it looks likely that the president could be impeached before Christmas. David? Mary Bruce tonight. Mary, thank you.

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

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