Impeachment 2.0, now underway at the Capitol, has just this morning undergone a dipsy-doodle of “yes, we’ll have witnesses” followed almost immediately by “no, we won’t have witnesses.” You’ll likely see various explanations for that reversal.
The explanation which makes most sense to me is that, had they been permitted, Nancy Pelosi would be called as a witness. She might be forced to admit that, prior to Jan. 6, Trump had offered her troops for protecting the Capitol and she’d turned them down, ridiculing the need. Not a good look for Lucrezia Borgia’s latest reincarnation.
I don’t have inside info so it may turn out that another explanation is eventually accepted as definitive.