“While these facts are pretty damning, open-minded senators (assuming any exist) would be interested in further exploring Trump’s motives by examining relevant documents and hearing from officials (such as Mulvaney and former National Security Adviser John Bolton) who directly interacted with the president before, during, and after the aid freeze. Maybe the inferences that Sondland and other underlings drew about Trump’s reason for blocking the money were mistaken. Maybe Trump’s after-the-fact explanations, however implausible they might seem, are true. But unless several Republican senators side with Democrats in seeking additional evidence, those crucial questions will remain unanswered during Trump’s trial.”
https://reason.com/2020/01/22/the-senate-can-but-probably-wont-fill-the-gaps-in-the-case-for-a-ukraine-quid-pro-quo/