the back of my mind. i think it was the best decision of my life to go to cancer treatment centers of america. it feels good to get your life back. the evolution of cancer care is here. learn how advanced genomic testing is changing the way we fight cancer at cancercenter.com/genomics appointments available now. in the impact segment tonight. president obama getting political in his final address to the united nations general assembly. the president used the occasion to take some not so subtle shots at donald trump. >> today a nation by walls with only imprison itself. there appears to be a growing contest between aauthor terrorism and liberalism right now. i want everybody to understand i'm not neutral in that contest. i believe in a liberal political order. it's no surprise that some argue the future favors the strong man.