Transcript for Impeachment managers invoke words of Alexander Hamilton
And now to the impeachment trial of president trump tonight, day two, and now the Democrats up first. Making their case. They get 24 hours over three days to do this. They are arguing at this hour, the president abused his power, they say, trying to get Ukraine to announce an investigation into the Bidens and withholding U.S. Aid that had already been passed by congress. Lead maker Adam Schiff arguing the president should be removed from office. And trying to convince key moderate Republican senators to allow for witnesses in the trial, to make it a fair trial, he says. Tonight, the president's team already responding and ABC's Mary Bruce on the hill. Reporter: In the senate chamber today, the democratic prosecutors invoking the words of Alexander Hamilton, saying the framers warned against a president like Donald Trump. And his object is to throw things into confuse, that he might ride the storm and direct the whirlwind. Reporter: Chairman Adam Schiff saying the president's push to convince Ukraine to investigate Joe Biden is exactly the kind of scenario the framers feared. They feared that a president would subvert our democracy by abusing the awesome power of his office for his own personal or political gain. Reporter: Democrats say the president withheld nearly $400 million in military aid to serve his own political needs. The president used the hold on military aid as leverage to pressure Ukraine to announce these investigations that he hoped would help his re-election campaign. Reporter: The president, it appears, was watching from air force one, just 30 minutes later, trump tweeting, "No pressure." In a series of methodical speeches, the Democrats laid out their case, arguing the facts are not in dispute. They can't contest the facts. The president was the key player in this scheme. Everyone was in the loop. He directed the actions of his team. He personally asked a foreign government to investigate his Reporter: Democrats warned the president must be removed from office to protect the 2020 election. The president went to extraordinary lengths to cheat in the next election. Reporter: The Democrats say the evidence paints a, quote, overwhelming and damning picture, and are imploring Republicans to let them call additional witnesses the white house has blocked. Only then, they say, will the world know the full extent of the president's wrongdoing. You'll hear from witnesses who have not yet testified, like John Bolton and Mick Mulvaney, Mr. Blair and Mr. Duffy. And if you can believe the president's words last month, you will also hear from secretary Pompeo. You will hear their testimony at the same time as the American people. That is, if you allow it. But that remains an open question tonight. Mary Bruce live at the capitol, and Mary, as Democrats there try to convince those moderate Republicans to allow for witnesses, the president's defense team already prepared to argue against that, and tonight, they're already vowing to challenge the facts already presented today? Reporter: David, throughout this entire day, the president's team has had to sit silently in the chamber. They say that they are now revising their defense, based on what they have heard from the Democrats and, of course, how the president reacts. David? That's right. They have to sit through three days of this before they make their case. Mary Bruce, thank you.
This transcript has been automatically generated and may not be 100% accurate.