Iran warned North Korean leader Kim Jong Un on Tuesday that President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE could still scrap an agreement committing the U.S. to unspecified “security guarantees” in exchange for the denuclearization of the Korean Peninsula.

"We don’t know what type of person the North Korean leader is negotiating with," Mohammad Bagher Nobakht, a spokesman for the Iranian government, said, according to Iran's IRNA news agency.

"It is not clear that he would not cancel the agreement before returning home," he continued, according to a translation of the quote reported by Reuters.

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Trump signed the agreement with Kim on Tuesday in Singapore, where the two leaders held a historic summit to discuss the North's nuclear ambitions and ways to reduce tensions on the Korean Peninsula.

Tehran's warning to Kim came roughly a month after Trump announced that he would back out of a 2015 deal with Iran that sought to curb the Islamic Republic's nuclear ambitions in exchange for sanctions relief.

That move prompted outrage from Iranian officials, who accused Trump of being an unreliable leader willing to renege on U.S. commitments.

Trump had railed against the Iran nuclear deal for years. In his first year in office, he repeatedly threatened to withdraw from the deal, unless it could be renegotiated to address Iran's activities beyond its nuclear ambitions.

Those efforts ultimately fell flat, prompting Trump to withdraw from the pact and reimpose sanctions on Tehran.