washington u.s. president barack obama say friday donald trump recent comment south korea japan acquire nuclear weapons show lead republican presidential candidate well inform international relations trump tell new york time interview publish sunday would consider let countries build nuclear weapons rather count u.s. protection north korea china obama make secret disdain billionaire businessman continue theme repudiation trump pronouncements statements mention tell us obama tell reporters news conference conclusion nuclear security summit tell us person make statements know much foreign policy nuclear policy korean peninsula world generally obama say trump candidacy come topic world leaders sideline summit lament state republican race even ... countries use carnival atmosphere politics want sobriety clarity come u.s. elections understand president unite state need know go around world say obama take apart trump position point point u.s. alliance japan south korea one cornerstones america presence asia pacific region underwrite peace prosperity say relationship boon u.s. commerce influence addition prevent nuclear escalation conflict add mess investment rest sacrifice men women make back world war ii fight throughout pacific obama say want somebody oval office recognize important be obama trump n't know much foreign policy world