The context is all in the audio clip. I let Rush speak for himself. If he said any more than that, I welcome any transcripts, additional audio clips, whatever. The more the better.
I also noted in #1 he did not say the word "Minutemen," but simple logic tells us that's who he's talking about and supporting.
Some of us have heard Rush talk about illegal immigration before, so that knowledge brings even more context.
I did not listen to clips. (hate hearing things twice)
Rush did not mention them by name because he just does not do it unless he wants to overload someone web site or whatever. He is way careful about that.
Sure, Rush is concerned with illegal immigration. We all are.