Coats and Wray acting in unison.
They know POTUS likes to drop bombs over bad guys around Christmas, and they want to distract–both from Giuliani and the respective investigations. Most people are off at the end of the year.
Also, they know the Senate trial won't allow evidence that brings up Ukrainian corruption, because so many in there are corrupt:
https://theconservativetreehouse.com/2019/12/08/wow-oan-stunning-lutsenko-interview-outlines-marie-yovanovitch-perjury-george-kent-impeachment-motive-lindsey-graham-motive-to-bury-investigation/
Game theory
'Other' business that won't be proceeding
Rod Rosenstein authorized the scope of the Mueller investigation–did he also authorize Horowitz's? Maybe misspelling 'Corney' to prevent Horowitz from legally pursuing it?
https://www.justice.gov/opa/press-release/file/967231/download