According to the ambassador, the US State Department requires the White House every 90 reports on this agreement. Iran is conscientiously observing all the clauses of the treaty, but this does not mean that we have no questions in Tehran.
President Trump may not certify the document, but the US, anyway, will still support the deal.
By the way, in recent months the administration of the White House has twice confirmed the information that Iran fully adheres to all the rules of the agreement between the countries.
We add that Iran limits its nuclear program in exchange for the lifting of sanctions by the US.
As reported in "URA-Inform", recently the US authorities imposed new restrictions against 18 individuals and legal entities from Iran.