tonight, several developing stories as we come on the air. the stunning admission. actress felicity huffman agreeing to plead guilty tonight. her letter now just in. her apology, her message to her own daughter, and to the young people whose spots in school were taken. one of several parents agreeing to plead guilty. how much prison time could they face? also breaking tonight, stopped just in time. authorities say the potentially deadly terror plot discovered here in the u.s. investigators say a man planning to plow a u-haul van into a crowd. tonight, right here, the areas he had been looking at. also tonight, the horrific scene in afghanistan. three american troops and a contractor killed. several others wounded. the head of the secret service out tonight. the director no longer in charge, just one day after the president forced homeland security secretary kirstjen nielsen to resign.