Iranian Foreign Minister Javad Zarif is ripping the U.S. as "unreliable" in the wake of a report saying the Trump administration is leaning toward decertifying the nuclear deal with Tehran.

"I think what the Unites States is doing in addition to being unpredictable, which might sometimes work, is proving that it is unreliable," Zarif said Sunday on CNN's "Fareed Zakaria GPS."

"This deal is not a bilateral agreement. It’s not even a multilateral treaty; it’s a Security Council resolution. And the United States is a permanent member of the Security Council," he added.

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"What is important for the international community is to be able to rely on the words of the United States as a negotiation partner," he said, adding that Iran in the nuclear deal "accepted certain concessions and the United States accepted certain concessions."

Zarif's comments come after President Trump used his debut speech at the U.N. General Assembly last week to slam the deal, calling it an "embarrassment."

“The Iran deal was one of the worst and most one-sided transactions the United States has ever entered into,” Trump said in the remarks. “Frankly, that deal is an embarrassment to the United States, and I don’t think you have heard the last of it, believe me.”

Iran announced on Saturday that it had successfully conducted the test of a new ballistic missile design, and pledged to continue developing weapons.