Missing son. Hes alive soi kw he is. The family not giving up the search. Terrifying video of a lion tamer mauled by one of his own animals. The attack in front of a huge crowd of spectators. Why the trainer says he is to blame. And they dont have drivers licenses, but these young racers are already proving theyve got a need for speed. This is nbc nightly news with kate snow. Good evening to our west coast viewers tonight. With the president calling for a tough new approach on the southern border, late today he announced on twitter that his secretary of Homeland Security will be leaving her position. In her job, Kirstjen Nielsen became the face of controversial policies. Shes come under intense scrutiny from democrats. While shes publicly supported the president s policies, shes also been berated by him behind closed doors. Kelly odonnell joins us live from the white house. Whats the latest . Reporter this is no doubt a major ohio static in the president sthe president s cabi. Frustrat