To their credit, Pence and the Congress insisted on finishing what they’d started, certifying Biden’s victory once the police had secured the Capitol. But surely the most damning detail, as reported by the Washington Post, was this: Trump never spoke to his vice president during the attack. “Trump never called him that day or in the days following to make sure Pence was okay — or to discuss a governmental response to the deadly riots the president incited,” the Post later reported. Instead, Trump tweeted that Pence “didn’t have the courage to do what should have been done to protect our Country and our Constitution, giving States a chance to certify a corrected set of facts, not the fraudulent or inaccurate ones which they were asked to previously certify. USA demands the truth!”

This tweet alone is a key piece of evidence for the House impeachment team. But Tim Miller, the former GOP operative, says the prosecution must go further than that. “If it’s true Mike Pence and Donald Trump didn’t talk that whole time, that’s a grave personal affront to the vice president but it also shows there was no effort to plan a response to the attack on our Capitol,” Miller says, adding, “It’s incumbent on the Democrats to call on him to testify. Their presentation has been excellent but it’s missing what happened on January 6th between 1 and 6 o’clock.”

Donald Trump has already said he will not testify in his impeachment trial. That leaves one person who can tell the full story of what Trump did and didn’t do on that historic day.