Trump writes to Iran urging nuclear talks
Tehran adhered to the deal until a year after Washington pulled out, but then began rolling back its commitments.
Trump, who returned to the White House in January, reinstated his "maximum pressure" policy of sanctions against Iran over allegations the country is seeking nuclear weapons capability.
Tehran has consistently denied the claims and repeatedly expressed a willingness to revive the accord but efforts to that end have faltered.
Last month, United Nations atomic agency chief Rafael Grossi said Iran was "enriching (uranium) at 60 percent, so almost weapon level" and that the 2015 deal was an "empty shell" that was "no longer fit for purpose."
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