Different groups pay law/lobby firms in dc to influence US policy every day, and I'm assuming those lawyers pay their taxes on the income they get from those groups, both foreign and domestic. I have a hard time drawing a moral distinction between what these people do every day and people like Mr. Manafort, although there is obviously a legal one. Would what he did rise to the level of investigation if he had hired it out and paid his taxes?
Always follow the money
Always follow the money