What motivated the shooters . Who were their targets . Can a nation so divided find a way to stop this senseless, shocking violence, and what will the president do in the wake of these Mass Shootings on his watch . Well take these questions to acting white house chief of staff Mick Mulvaney here in a sunday exclusive. Announcer from abc news, its this week. Here now, chief White House Correspondent jonathan karl. Good morning, and welcome to this week. Its difficult to find the words to describe this moment in time. I can rattle off the sickening statistics about gun violence in america. Over the last five years we have endured five of the ten deadliest Mass Shootings in modern American History. I can list the cities and towns now synonymous with tragedy. Weve heard all of that before after newtown and Sutherland Springs and parkland, charleston, orlando, pittsburgh, after aurora, Virginia Tech and columbine, pearl and paducah, the condemnation, the calls to action, the thoughts and pr