Donald Trump
3 days a week
And the existing guest lineup the other two days, especially Mark Steyn. Could work, and work well.
Rush had a unique talent to promote the conservative agenda in an entertaining way - and skewer liberals 3 hours a day, 5 days a week. His intellect, character, personality and a lifetime of perfecting his show - made him the #1 heard radio talk show in the world.
Donald Trump makes a good radio show guest but he does not have the talent to fill Rush's shoes or be a radio host for any extended period of time IMHO.
I don't know that anyone has Rush's kind of talent.
It would be Heaven!!!