The FBI hasn't posted sufficient cause. There's zero communication coming from the FBI or the DOJ. This a secret operation and they're hoping they find something they can use.You sound like a diehard Trumper.
The fact is that the FBI showed sufficient cause to have a search warrant issued by a federal judge.
Beyond that, there is only speculation, often self-serving.
By now, if this was on the level, they would have made an announcement.
So far....nothing.