god empowered him, and my father, when he stood to preach, he wasn t preaching his message, he was preaching god s message. reporter: while graham preached to packed stadiums, he was also a pastor in the white house, no matter the party of the president. he believes god put him in that place so he could be a spiritual counselor and adviser, and every one of the presidents always at some point in that relationship would talk to my father about spiritual things. reporter: franklin graham might have become a prodigal son. in the beginning, he was not about his father s business. i saw my father preach in madison square garden, and i was a little embarrassed, i think the first time i heard him preach. that s my father up there, and i kind of slid down in my chair. reporter: young graham was kicked out of his first college. but by 22, he returned to the fold. and while the resemblance to his father is striking, he is his own man. outspoken about islam,