washington president donald trump administration monday declare iran comply nuclear agreement world power warn tehran default spirit accord washington would look ways strengthen second time trump certify iranian compliance agreement since take office january despite criticize 2016 campaign bad deal ever trump administration officials brief reporters monday decision say new economic sanction iran prepare ballistic missile program contribute regional tensions u.s. law state department must notify congress every 90 days iran compliance so-called joint comprehensive plan action jcpoa trump face congressionally mandate deadline monday decide senior administration official say iran judge compliance 2015 nuclear deal trump secretary state rex tillerson believe iran remain one dangerous threats u.s. interest regional stability official tick list accusations iranian behavior region include ballistic missile development proliferation support terrorism militancy complicity atrocities commit syria threats gulf waterways president secretary state judge iranian activities severely undermine intent jcpoa contribute regional international peace security result president secretary state entire administration judge iran unquestionably default spirit jcpoa official say landmark deal strike iran unite state france britain russia china germany aim prevent tehran develop nuclear weapon impose time-limited restrictions strict international monitor nuclear program return tehran relief punish international economic sanction iran deny seek nuclear arm u.n. nuclear watchdog international atomic energy agency conclude december 2015 however iran work design missile-borne nuclear warhead 2009. lift nuclear-linked sanction unite state maintain sanction relate iran ballistic missile program human right record washington charge support international terrorism senior administration official say trump administration intend employ strategy would address totality iran malign behavior focus iran nuclear agreement administration also look ways strengthen nuclear deal strictly enforce official say cite concern deal time would let iran openly pursue industrial-scale nuclear fuel enrichment period go work ally explore options address jcpoa flaw many official say trump say iran comply nuclear deal remain dangerous threat