washington u.s. house panel investigate 2012 benghazi attack kill ambassador libya christopher stevens three americans release report incident next month congressman lead inquiry tell msnbc friday representative trey gowdy charge two-year-old investigation house representatives tell msnbc committee report would finish release republican democratic political party hold conventions july nominate candidates 2016 presidential elections go get report next month gowdy tell msnbc interview add want finish investigation last summer able get document need administration stop investigation executive branch agency give document still owe document gowdy say add report would say miss agencies report fully republican-led panel criticize allow investigation drag long accuse politicize incident hillary clinton lead contender democratic presidential nomination secretary state time attack republicans accuse state department slow hand document need u.s. panel probe benghazi attack report within month chair