Washington: As Adam Schiff, the Democrats' lead impeachment manager, made his final statement to the US Senate late on Thursday (Friday Australian time) his voice cracked with emotion.

Ditching the detailed evidence and historical references that had so far dominated Donald Trump's impeachment trial, he addressed the senators seated before him in starkly moral terms.

Adam Schiff has been the Democrats' breakout star of the impeachment trial. Credit:AP

"You know you can't trust this President do what's right for this country," Schiff, the chair of the House Intelligence Committee, said.

"You can trust he will do what's right for Donald Trump. He'll do it now. He's done it before. He'll do it for the next several months, he’ll do it in the election if he's allowed to. This is why if you find him guilty you must find that he should be removed. Because right matters."