Yes, but so many legal eagles have said that FBI investigations are never confined to their initial authorized mission, if along the way they pick up on other possible criminal activity among the maze of witnesses they approach.
Recall that MANAFORT was already under FBI investigation years back, and that investigation was never closed.
This is to say that they had a running start on MANAFORT.
I am not one who claims manaforts finances are beyond scope. Many here have including one of the lawyers here.
So if manafort outside so is podesta