is going to bring america back, both at the leadership level and in the neighborhood where we can begin to reignite the spirit of the united states of america. and let's stop fighting. >> reporter: another republican debate that was all about donald trump. he took the majority of the attacks and dominated the air time. and despite all of the efforts to derail and did h decry him hl dominates the polls and the race. >>> police in los angeles are investigating the discovery of a knife believed to be from the home off. j simpson. simpson was acquitted of the 1994 murder of his ex-wife nicole and her friend, ron goldman. the knife is thought to be from simpson's former home. and was discovered by a member of the public during the building's demolition. >> within the last month l. a.p. d became aware of an amount that was discovered at the rocking ham property pros by during the demolition of that site. we need to get it. we don't know if that's an accurate account of how this item came in...