The suicide bombing at pop star Ariana Grande's concert on May 22 literally shook the ground all around Europe's second largest indoor arena. But it also sent shockwaves around the world because the attack on a concert where very young children were attending left no doubt that terrorists today have no limits. On this program, we get the details about what happened. Philip Mudd, one of the world's best counterterrorism analysts, puts the event in perspective. Also, a senior U.S. counterterrorism official tells us what we can expect in terms of security changes here in the U.S.