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He has almost certainly done a lot of money laundering for dubious Russian organizations, and he has also funded his businesses with Russian money. His indebtedness to powerful Russians will have been part of their leverage. And it would be surprising if there weren’t at least a little blackmail thrown in too.
Everyone paying the slightest bit of attention has known trickle down economics are a hoax since the 1980s. The problem is that almost half the people in the USA are ignorant supporters of fascism.