I did not hear Michael Savage point out any of this information so it does not come from him.
There may also be heated arguments (with actual violent statements, whether the threat is genuine or not) that come from email exchanges back and forth or even from things he said to provoke the response on his weblog.
Basically we are getting Baghdad Bob's side of this story and he will spin it as he wants.
If he received death threats then he should go to the authorities since they deal with such matters. If he does not then I assume that there is little meat to the claims.