washington u.s. republican presidential front-runner donald trump take detour campaign trail thursday hold unexpected meet washington reince priebus head republican national committee immediately clear two men discuss meet come months tension trump party seek represent nov. election trump week abandon pledge support eventual republican nominee also complain party delegate allocation process seek win 1,237 delegate necessary nomination nice meet reince priebus gop look forward bring party together —- happen trump write twitter barry bennett adviser trump campaign say msnbc meet trump help rnc raise money meet help rnc say trump also meet foreign policy team capital thursday series statements billionaire businessman national security issue draw criticism recent interview trump declare nato alliance obsolete describe saudi arabia dependent unite state say japan south korea may need develop nuclear program u.s. security umbrella costly maintain msnbc town hall wednesday night trump rule potential use nuclear weapons europe middle east combat islamic state militants would never take card table say max boot conservative national security expert member council foreign relations write commentary magazine week trump singularly unqualified commander-in-chief trump command enemies would field day moscow beijing must lick chop desire abandon u.s. ally europe asia friends would face mortal threats single big threat u.s. security know boot write trump unexpected meet republican party chairman