With one in three American children obese or overweight, doctors are declaring childhood obesity a national health epidemic. The problem has gotten so severe that for the first time in our country's history, children will live shorter lives than their parents did.

Today on American Morning, Carol Costello talks with New Jersey Mayor Cory Booker and former Senate Majority Leader Dr. Bill Frist to discuss how they're teaming up to fight this urgent problem. If we don't do something to curb the childhood obesity epidemic, "we could face the greatest health challenge in a generation," Booker says.