For the first time in more than 50 years, the world's largest nuclear powers, the U.S. and Russia, do not have an agreement limiting their long-range nuclear arsenals. Margaret Brennan explains what this could mean in an already dangerous world.
At Ave Maria University in Naples, Florida, students are being urged to stay home as the number of measles cases across the campus has surged to at least 20 people. Cristian Benavides reports.
Cameron Guthrie, the son of Nancy Guthrie, released a new video Thursday night pleading for his mother's safe return. Nancy Guthrie, who is also the mother of "Today" show co-host Savannah Guthrie, has been missing since Sunday.
