New evidence for impeachment keeps turning up. That’s why we need witnesses.

Joshua Geltzer wrote an article for The Washington Post discussing new evidence for impeachment and the necessity for witnesses in the Senate trials.

(Washington Post) If you think the impeachment proceedings against President Trump haven’t changed any Republicans’ minds, look again. In the past week alone, influential evangelicals and conservative pundits have called for Trump’s removal. Only one notable group of Republicans is — at least for now — still united in indulging Trump: those serving in Congress.

But it’s the 53 sitting Republican senators who are poised to determine the president’s fate, as 20 of their votes will be needed to remove Trump from office. That makes it essential that they see in the Senate chamber a real impeachment trial, with real witnesses and other real evidence — something that four Republican senators can make happen by siding with Democrats and with the overwhelming public support for having witnesses testify. And there’s plenty of new material for senators to consider in a trial.

Start with the bombshell that exploded late Friday night.

An email the government had tried to hide but was forced to hand over in a lawsuit shows precisely why testimony from a crucial witness like the Office of Management and Budget’s Michael Duffey can still add critical details to our collective understanding of Trump’s Ukraine misdeeds. Duffey’s email reveals stunning illegality at the direct behest of the White House. It’s no surprise that he’s one of the four witnesses Senate Democrats have asked to testify, even before the email was released. The email underscores just how essential it is to have Trump’s impeachment trial work like any other trial does: with the presentation of evidence.