Levin received a tip that he was being investigated. Levin was the one that revealed the relationship.
Who is possible future step son works for is irrelevant. What is relevant is that one of the campaigns was trying to intimidate him.
If that doesn’t disturb you then I don’t know what to say.
If he is a Senate Staffer that is a big deal. Big enough that Levin didn’t think he should disclose it - wonder if he would think the same thing of Hillary.