Iranian officials have said they will not renegotiate.
It said the reminder was triggered by "current events" but gave no details.
Trump is expected to decline this week to certify Iran's compliance in the 2015 agreement, referring it to Congress.
President Donald Trump's decision on the 2015 Iran nuclear deal could come on Friday, and experts say the "writing is on the wall" that the administration won't recertify the landmark agreement and he likely will turn his attention to getting European support on fixing it.
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It is also expected that the Trump administration could announce a fresh set of sanctions, possibly non-nuclear, against the Middle East nation like penalties against Iran's ballistic missile programme. If the president doesn't certify compliance with the requirements, Congress has 60 days to decide whether to re-impose or "snap back" sanctions lifted under the agreement.
Trump has threatened to scrap the agreement, calling it the "worst deal ever".
The Republican chairman of the U.S. House of Representatives Foreign Affairs committee said on Wednesday the worldwide nuclear deal with Iran should be strictly enforced by Washington working with its allies, but did not call for an end to the agreement.
If Trump does decertify the accord as expected, it would put him at odds with Defense Secretary James Mattis, who last week said Tehran was "fundamentally" in compliance with the agreement and that the US should stick with the pact.
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If he chooses not to certify, Trump would be defying the opinion of some of his top advisers, European countries and the International Atomic Energy Agency. Ted Deutch, D-Fla., and Nita Lowey, D-N.Y.
"What Trump is doing is opening a very unnecessary "Pandora's box" of troubles at a time when he is unable to competently handle the crisis with North Korea's nuclear program", said Daryl Kimball, executive director of the Arms Control Association, which supports the Iran deal.
Deutch said the danger of walking away from the agreement is that those expiration dates "would have effectively dropped from a decade to a day" because Iran would be freed of its obligations under the deal.
Drafts of two proposals seen by The Associated Press, one from Senate Foreign Relations Committee chairman Bob Corker and one from committee member and deal critic Sen. "We thought it was the wrong decision", Cardin told reporters recently. "We don't want to see the United States violate it".
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