president obama speak reporters close fourth nuclear security summit washington d.c. republican frontrunner donald trump statements regard advocacy proliferation nuclear weapons trump state early week countries nuclear weapons include japan south korea also suggest us get rid 70 years arm negotiations agreements president obama say trump comment person make statements know much foreign policy nuclear policy korean peninsula world generally president make statement trump way serious time tone seem indicate think trump absolute moron reference america nuclear umbrella japan south korea president say one cornerstones presence asia-pacific prevent possibilities nuclear escalation conflict mess investment rest sacrifice men women make want someone oval office recognize important one imagine president thoughts republicans offer gop nominee creepy ted cruz crazy trump point game president probably humor alarm choices.watch video pres obama suggest trump `` n't know much foreign policy nuclear policy `` https //t.co/y21hlhwl2x https //t.co/l54prixmhy abc news abc april 2016 feature image via video screenshot watch president obama hilariously destroy trump nuclear ideas