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this comes as carson faces new scrutiny for his claims about a violent past. joe johns is "outfront." >> candidates can come -- >> reporter: ben carson's quiet and did i any dignified approach says that was not part of his past. carson wrote in his book about striking a schoolmate in the face with a combination lock, nearly punching his mother, smashing a kid's face with a rock. carson said he also tried to kill a friends identified as bob in a disagreement over the radio. he describes his temper as pathological, a disease that made him totally irrational. >> had a large camping knife and i tried to stab him in the abdomen. and fortunately, under his clothing, he had on a large metal belt buckle. and the knife blade struck with such force that it broke.