>> we have a president that wants to show how tough he is. everybody over there, they are not babies. they are not the j.v. they just knocked down an airliner, they say it's 99. 9% as of today. >> the front runner. over the weekend he stepped up attacks for dr. ben carson that edged ahead as claims carson's made about his past are being challenged. on cnn state of the union, donald trump fanned the flames of skepticism over carson's contention he was violent in his youth. >> i just don't know. i mean, i'm not involved. i don't really know. it's a lot of things, you know, when you say hitting your mother over the head with a hammer when you talk about hitting a friend in the face with a lock, a padlock, and you know, you talk about stabbing someone and got stopped by a belt buckle, which, belt buckles pretty much don't stop stabbing, they turn and