"A valid inspection request requires credible info on illicit activities, not just 'why can't I look there?' Haley offered none, has none,” Matt Duss tweeted on Thursday.
Duss made the remarks as the International Atomic Energy Agency released its newest report, confirming once again that Iran is complying with its commitment under the July 2015 nuclear accord.
"Iran adhering to nuclear deal with world powers, UN watchdog says,” Duss said in a separate tweet.