Im sure this question has been asked before. Ive watched GFI & GFII many times and learn something new everytime I watch.

I was just wondering who Turnbull is and what his significance is to the film, he is referenced by Mike and Senator Geary at their meeting at Tahoe. Mike to Sen. Geary: Turnbull was a good man & Sen. Geary to Mike: From now on you deal with Turnbull.