and legislators also. reporter: trump is a pacesetter for the entire republican field which continues to grow. north dakota governor expects to announce today. anger, yelling, in fighting, that s not going to cut it anymore. let s get things done. reporter: and former new jersey governor chris cyhristie who jumped into the race yesterday. i m going in there to take out donald trump. i want him to win. i don t want him to win. very big first day live ahead for the former vice president. after this kickoff rally here in iowa, he ll be spending the evening at a cnn town hall. phil? thank you so much. great reporting as always. tonight the best in the business. dana bash will moderate a cnn republican presidential town hall with mike pence. you can watch it here and only here at 9:00 p.m. eastern.