judges this year are sioux city artists pauline sensenig and robert gillespie. jenna: fred's back next stay with us. tonight, l >>> breaking news tonight. what donald trump just threatened to do. trump tonight saying he might sue ted cruz over being born in canada. bernie sanders is asked, is he standing in the way of history? the first woman president. how he answers. >>> and a horrific machete attack at an american accident. >>> and, temperatures not seen in almost 100 years. >>> silence broken. >> could you have prevented what happened to columbine? >>> and tim tebow is here tonight. hard to imagine he had trouble at the prom. tonight, how he's helping thousands. >>> good evening. great to have you with us on a busy friday night. breaking news in the race for