I don't understand what "the threat" is. From my point of view, the damage is done. A disclose has been made that Levin would prefer to keep hidden. There is no way to unring the bell. All that's changed is now, more people know his fiancee's son works with or is associated with camp Cruz.
That said, maybe there is "more," such as the story being false (like Beck saying that Trump voted for Obama).