washington u.s. house speaker paul ryan say wednesday try constructive possible look forward thursday meet presumptive u.s. republican presidential nominee donald trump aim unify fracture party ryan high-profile republican endorse trump warn bring party factions together would take time grueling primary season suggest might instant result get-together thursday trump republican national committee chairman reince priebus trump takeover republican party shake party establishment prompt soul-searching whether reluctantly get behind cede role nov. presidential election hillary clinton expect democratic opponent trump face pressure tone rhetoric clarify policy position step toward unify divide party republicans alarm recent talk raise tax wealthy ryan also face pressure smooth things say last week yet ready support trump extraordinary statement see keep distance presumptive nominee leave open prospect run president 2020 try constructive possible real unification ryan tell reporters wednesday meet fellow republicans house representatives tough primary go take effort commit put effort say ryan say really know trump want part unify process full strength fall win election afford lose election hillary clinton ryan say ryan 46 conservative congressman since 1999 run unsuccessfully vice president 2012 trump 69-year-old billionaire real estate developer different republicans see eye eye many things immigration trade ryan say wednesday differences issue big-tent party plenty room different policy dispute party one lawmaker wednesday house republican gather raise request trump meet republicans house source room say ask name meet expect happen sometime july 18-21 republican convention cleveland source say tuesday night ryan speak phone 16 minutes trump emissary former republican presidential candidate ben carson accord carson spokesman armstrong williams republicans rankle trump policy proposals include declaration nato obsolete call temporarily ban muslims enter country house lawmakers back trump express displeasure ryan withhold support small group meet speaker late wednesday aide one lawmakers say trump potential appeal great number republican voters must make change make party leaders comfortable republican officials lawmakers say think show kind president would senator susan collins say believe one foreclose possibility eventually support need see him ryan say last week yet ready support trump candidate fire back ready support ryan agenda wednesday trump warm word ryan say think fine see happen meet trump tell fox news make deal great trudge forward like do ryan strike conciliatory tone ahead trump meet