(afp) --Under the terms of the two-year-old agreement, Tehran scaled back production of nuke-making material in return for massive sanctions relief.
The Trump administration faced a new congressional deadline Monday to say whether Iran has curbed its nuclear weapons program in line with the accord.
"The conditions," according to one official who the White House would not name publicly, "have been met, based on information available to the United States."
The 2015 agreement rests on a series of technical benchmarks, and was seen in Washington as a way of avoiding military action to prevent Iran from getting a nuke.
But it has not relieved tensions between Tehran and Washington, which continue to clash particularly over conflicts in the Middle East like Syria and Yemen, where Iran-backed forces.