Starting from the bottom and working up allows the prosecutors to test legal theories. Some of these statutes have rarely been used.
They can build their court rulings.
Oh, and by the way, the Post said this:
We have evidence that prosecutors asked questions about Trump's inner circle in early January, 2022: https://www.washingtonpost.com/national-security/trump-jan-6-investigation-garland/2022/01/15/e55a3ca2-7555-11ec-b202-b9b92330d4fa_story.html
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