Washington Summit to Tackle Keeping Nuclear Materials From Terrorists' Reach

The White House nuclear security summit this week will, for the first time, include a special session on how to ensure that terrorist groups like Islamic State do not get their hands on nuclear materials. At this year's summit, a biennial event, delegations from more than 50 nations will discuss evolving nuclear threats and ways to minimize and prevent them. VOA's White House correspondent Mary Alice Salinas has more.