On Nov. 15 , Mr. Giuliani met in Manhattan with supporters who could form the core of a national fund-raising effort , including Thomas O. Hicks , the owner of the Texas Rangers ; Mel M. Immergut , the chairman of the New York law firm Milbank , Tweed , Hadley & McCloy ; and William E. Simon Jr. , an investor who ran for governor of California in 2002 .