They are investigating him by raiding his daughter??? Sounds like something they do in Pakistan.
Well, the accusation is that Weldon helped his lobbyist daughter get gigs, so she would be part of any charges and it's logical to assume that she might have evidence.
However, the fact that they're investigating Weldon for his one daughter but NOT investigating Reid, whose sons (4?) are all lobbyists representing firms with issues that their father has helped with is what's totally absurd about this to me.