ASHISH JHA, SUNDAY ON “ THIS WEEK WITH GEORGE STEPHANOPOULOS ” Alejandro MayorkasSecretary of Homeland SecurityExclusiveRep.... Ashish JhaDean, Brown University School of Public HealthPlus, ABC News Chief Justice Correspondent Pierre Thomas and former Acting DHS Undersecretary for Intelligence and ABC News Contributor John Cohen analyze the latest developments in the New Orleans attack and Las Vegas explosion..... You can also follow the show on Twitter here....