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Bingo
Check his income. Cash infusions
Treasonous acts
From what I understand you can do an open records request at the state level (it’s always better and faster than a foia) and find out how much tax he paid at the state level by which you can figure out the taxable income (as long as there is state income tax). However, the target gets to know who made the request (in my state that’s the rule).
That being said, if he is getting extra money I couldn’t imagine it coming in the form of traceable income. Although, some of these people may have received bonuses that could be questioned.