From the September 16 edition of Premiere Radio Networks' The Rush Limbaugh Show:
LIMBAUGH: If Trump had not brought this issue up the way that he has, nobody else would have, and that fact that he did bring it up and the way he's dealing with it and what his opinions are and how he's expressed them is exactly why he's number one.
[...]
Make no mistake about the elites or whatever you want to call them inside the beltway. They are well aware of a vast majority of people opposing amnesty, comprehensive immigration reform or whatever. And if it hadn't been for Trump, then this would have been just another one of these issues where the insiders in Washington get their way, and there would have been added frustration, more anger and people I think in greater numbers would have just left the political system and tuned out, not planning on voting, being totally frustrated once again. And you add the Iran deal on top of that, it would have just been more frustration and anger aimed at Washington than we've seen in a long time. So he's absolutely right that he single-handedly has given voice to the majority opinion on this issue.