Iran's parliament speaker Ali Larijani, former top nuclear negotiator, talks to the media as he leaves the parliament in Tehran, Iran, Sunday, June 1, 2008.

Iran could withdraw from the nuclear deal it brokered with six world powers if the United States does the same, the speaker of the nation's parliament said Friday. 

Ali Larijani made the statement to reporters while on a visit to Russia.

"Certainly, that’s a possibility," he said, according to Russian news agency TASS. 

Larijani was asked the question about Iran's commitment to the nuclear accord ahead of a speech by President Trump expected to contain harsh criticism of the deal. Trump will formally announce his decision to decertify the agreement, a first step toward gutting the deal. However, aides said Trump is willing to consider an additional agreement that would pressure Tehran to prove it has given up the means to make nuclear weapons.

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Larijani said any move to scrap the agreement — brokered between Iran, the U.S., Britain, France, Germany, Russia and China — would represent an “insult to the U.N.”

The international organization was instrumental in securing the deal under which Iran agreed to limit its nuclear program in exchange for the lifting of sanctions.  

"They seem to have begun certain movements, which in the long run will cause a lack of order on the international arena," Larijani said in Russia during a meeting with Vladimir Volodin, the speaker of the Russian parliament’s lower house, TASS reported.

"The proof of that are the sanctions, which they have announced against Iran and against Russia, as well as the measures they recently began undertaking in relation to the nuclear deal with Iran," he added.

President Trump signed a new package of sanctions against Russia, Iran and North Korea in August.

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In his announcement Friday, Trump, who has called the accord an "embarrassment to the United States,” will also ask Congress not to re-impose economic sanctions right away; instead, he will call for new requirements on Iran in an effort to "fix" the agreement, said officials speaking on condition of anonymity pending the president's formal remarks.

"We believe this agreement is an important instrument to prevent a nuclear-armed Iran," German government spokesman Steffen Seibert said Friday, Deutsche Welle reported.

"If ... an important country like the United States comes to a different conclusion as appears to be the case, we will work even harder with other partners to maintain this cohesion," he said.

Norbert Roettgen, chairman of the German parliament's  foreign affairs committee, said: “Keeping faith to an agreement is absolutely fundamental in international diplomacy. And this is exactly what the president is putting into question," the Washington Post reported.

Roettgen added that a failure to back the deal “would have a disastrous consequence with regard to the Middle East. Perhaps a nuclear race would be ignited. It would drive a real wedge into international relations between the U.S. and Europe. And it would make North Korea even more complicated because the credibility of the United States would suffer.”

Trump faced a Sunday deadline to certify that Iran is compliance of the 2015 agreement, a step that is required every 90 days. A decision to decertify would come despite officials saying Iran has "technically" held up its end of the bargain.

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Contributing: David Jackson