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I believe there is no deep strategy behind this move. She is just playing with Trump’s nerves and wants to keep him under pressure for as long as she can. Spoiling his holidays.
Number ‘4’ seems the most likely as Pelosi will have been grilled not to risk the Biden’s having to appear…if called upon. This would open up a can of worms for the crooked Dems as the Ukrainegate scandal will probably reverse public opinion even more as the alleged wrongdoings of the Biden’s will make Trump’s trumped up charged pale into insignificance.