President Trump called the Iranian nuclear deal negotiated under the Obama administration an “embarrassment” during his first-ever address to the United Nations General Assembly Tuesday morning.

“We cannot let a murderous regime continue these destabilizing activities while building dangerous missiles, and we cannot abide by an agreement if it provides cover for the eventual construction of a nuclear program,” Trump said in his address before a global audience in New York.

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

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His remarks come amid speculation that Trump could choose to nullify the Iran nuclear deal before a key deadline next month. France and other nations have urged Trump not to scrap the deal, known as the Joint Comprehensive Plan of Action, which eased international sanctions in exchange for curbs on Tehran's nuclear weapons program.

Trump, who was expected to focus on destabilizing activities by North Korea and Iran during his remarks, took aim at Tehran for supporting Hezbollah and the government of Syrian President Bashar Assad, and fueling the crisis in Yemen.

“It is far past time for the nations of the world to confront another reckless regime, one that speaks openly of mass murder, vowing ‘death to America,’ destruction to Israel, and ruin to many nations and leaders in this room,” Trump said, accusing Iran of hiding behind a “false guise of a democracy.”

“It is time for the entire world to join us in demanding that Iran end its pursuit of death and destruction,” Trump said.