Iranian President Hassan Rouhani on Wednesday blasted President Trump's inaugural speech at the United Nations the day before, in which Trump tore into the Iranian nuclear deal.

In remarks to the U.N. General Assembly, Rouhani called Trump's speech "ignorant, absurd and hateful rhetoric, filled with ridiculously baseless allegations," and warned Trump against his continued criticism of the Iran nuclear agreement, according to reports.

“By violating its international commitments, the new U.S. administration only destroys its own credibility and undermines international confidence in negotiating with it or accepting its word or promise,” Rouhani continued. “It will be a great pity if this agreement were to be destroyed by rogue newcomers to the world of politics.”

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The Iranian president added that his country "will respond decisively to its violation by any party.”

In his Tuesday speech, Trump sharply criticized the nuclear agreement struck in 2015 by his predecessor, former President Obama, with the goal of preventing Iran from obtaining nuclear weapons. Trump called the deal an "embarrassment" to the United States in his address to the general assembly.

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

Speculation has swirled around whether Trump will nullify the Iran agreement before a key deadline next month. Multiple nations have urged the White House against scrapping the deal, which eased international sanctions in exchange for curbs on Tehran's nuclear weapons program.

Trump announced Wednesday morning that he has made his final call on whether the U.S. will stay in agreement, though he wouldn't say what it is.

"I have decided," he said. "I'll let you know what the decision is."