havana u.s. organizations work closely outgo obama administration improve relations cuba tuesday release four-page letter president-elect donald trump urge act rashly toward communist-run nation cuban study group organization cuban-american business leaders favor engagement washington-based engage cuba coalition arrange term memo say reflexively reverse course could pernicious consequences u.s. economic foreign policy interest prospect evolutionary change cuba trump transition include five cuban-americans vocal opponents detente close tie cuban-american lawmakers call return pre-obama efforts isolate cuba number trump appointees express hostility toward obama administration two-year effort normalize relations confident close evaluation confirm constructive engagement include reduction travel commercial barriers best strategy support cuban people boost u.s. job export signers report include u.s.-cuba business council national foreign trade council american society travel agents association international educators say argue policy improve human right island speed expansion internet access lead dialogue sensitive issue improve national security create job among positive result report follow release last week similar plea dozens u.s. agricultural organizations argue cuba important market products trump republican say dismantle still-fragile detente unless cuba give unite state good deal provide specifics expect review cuba engagement take office friday trump name jason greenblatt trump organization executive chief legal counsel negotiator sensitive international issue include cuba normalization relations old cold war foes include restoration diplomatic relations obama historic trip cuba sign 18 cooperation agreements use executive order punch hole embargo lift u.s. congress control republicans travel island unite state increase start direct flight cruise sign cellphone roam agreements manufacture significant trade deal reach u.s.-cuba detente supporters make last-ditch effort sway trump