vienna u.s. president donald trump administration pledge tuesday show great strictness restrictions iran nuclear activities impose deal major power give little indication might mean agreement 2015 deal iran six major power restrict tehran nuclear program exchange lift international economic sanction islamic republic trump call agreement bad deal ever negotiate administration carry review accord could take months say little stand specific issue trump administration also give clue potential policy shift tuesday statement quarterly meet u.n. nuclear watchdog board governors unite state approach question jcpoa interpretation implementation enforcement great strictness indeed statement international atomic energy agency iaea 35-nation board say cite deal full name joint comprehensive plan action u.s. statement first board governors since trump take office january also repeat language use administration former u.s. president barack obama deal legacy achievement iran must strictly fully adhere commitments technical measure duration say word identical use u.s. statement previous board governors meet november iaea police restrictions iran nuclear activities deal last month produce quarterly report say iran stock enrich uranium halve come close limit impose agreement report first specify much enrich uranium iran thank series agreements tehran major power clarify items would count toward stock major power criticize previous report specific enough items size enrich uranium stock u.s. statement call future report detail welcome inclusion additional level detail expect continue future say trump administration pledge 'great strictness iran nuclear deal