ambassador nicholas burns, very good to have you with us. thank you. >>> for more stories from around the world. >> we begin to capital hill where julia per seen about the recent security lapses at the white house. 32-year-old omar gonzalez jumped want fence at the white house and made it all the way into the east room much further than initially acknowledged. at the hearing lawmakers lamb basted pearson. >> i wish to god you protected the white house like you protect your reputation here today. >> right now you are protecting the most threatened american president in our nation's history. it's kind of a bad time to have something like this happen. >> have you ever heard of these guys? >> i believe that you have done a disservice to the president of the united states. >> next we head to hong kong where despite repeated threats from authorities the so-called umbrella revolution continues. protesters are asking to speak with hong kong's chief executive who on tuesday struck a defiant tone rejecting a meeting and demanding that protests end bef

. >> american ambassador, nicholas burns is a former undersecretary of state at the state depth, now a professor of practice of diplomacy and international politics at harvard. professor, this new move on the yazidis, how concerning is this and what do you do? >> well, shep, further evidence of the evil and despicable nature of isis and all the more reason the united states should be leading this effort, at least through the air, to attack them and to try to help safeguard the civilians in harm's way, the problem we have is airstrikes are limited in what they can do. what you really need or adequate ground forces. the ground forces are the iraqi army. in some cases the peshmerga but not in the mt. sinjar reason. so that's the weak link in the western strategy. building up effective, capable, aggressive ground forces that can take isis on, and really protect civilians on the ground, is the next order of business for the obama administration, and for this wider coalition of countries, arab and european, supporting the united states. >> military leaders note -- they put it simply, we're