plus, cruzares trump to sue him and him and a big fight boils over. >>> applrsus the fbi the tech giant ordered to help the fedsak into the san bernardino kler's ne still lock mths aftethe atck. why apple sa youprivacy is at stake. >>> testrone boost for men of a certain age. millions who take low-ted to body. a major sty reveals w well they work. >>> wh really infood. rns outhat parmesan cheese the grocery store might not be what yothink it whatou shoulkn >>> and the power couple who hit the jackt, ha billion times over. "nightly news" bins right now. >>> from > from nbc news world hequarrsn w york, this is "nbnitlnews" with lester holt. >>good evening. a surprisielopme ithe news tonight. a brand w nbc news/"wall streetournal" poll sws donald tmp slipp fm the p spotatnay falling behind ted cruz ong repuican primarvoters. our poll has cruz now ahead 28% with trump at 26 a marco rubio rounding out the top three at 17%. trump's tumble from the top spot comes as he and cruz trade threats, dares accusat ahead ofaturdas south carolinarimary trump nbc's hallie jackson has late details. >> rep