washington dark vision america siege describe donald trump acceptance speech republican presidential nomination mesh reality u.s. president barack obama say friday obama note bird chirp sun americans trump thursday night speech expound threats america illegal immigrants islamic state militants race-related violence idea america somehow verge collapse vision violence chaos everywhere really jibe experience people obama say white house news conference meet mexican president enrique pena nieto obama say violent crime rate america low 7-1/2 years office time last three four decades despite uptick murder cities year recent high-profile kill black men police officer time obama quickly arrange short meet pena nieto present leaders convenient platform criticize trump three weeks ago obama six months leave white house invite mexican president visit one last time u.s. president leave jan. 20. trump pledge build wall mexico border keep illegal immigrants drug force mexico pay new york businessman also promise slap tariff u.s. products make mexico seek radical change even discard north american free trade agreement nafta unite state mexico canada pena nieto first mention trump say respect trump presumptive democratic presidential nominee hillary clinton would work constructively good faith whoever win nov. election march pena nieto liken trump strident tone ascent dictators adolf hitler benito mussolini say friday never point finger candidates say anything say take context stress two nations futures closely bind closeness unite state mexico relationship governments solid unbreakable relationship millions people live nations pena nieto say obama say rate illegal immigration past decades praise mexico help address flood migrants flee central america work drug traffic mexico healthy economy mexico help us build stability security central america go lot solve migration crisis drug traffic problem wall obama say obama pena nieto praise 12-nation trans-pacific partnership tpp trade deal address criticisms nafta trump clinton say oppose tpp yet ratify u.s. congress go different visions go country obama say run list economic issue face nation go make good decisions base fear basis fact say obama dark trump vision 'does n't really jibe facts