WATCH LIVE: President Trump announces plan to decertify Iran nuclear deal

This event is scheduled to begin at 12:45 p.m. EDT.

WASHINGTON (Reuters) - U.S. President Donald Trump will strike a blow against the 2015 Iran nuclear agreement in defiance of international support for it on Friday, choosing not to certify that Tehran is complying with the deal in a major reversal of U.S. policy.

Trump will make the announcement in a speech at 12:45 p.m. EDT (1645 GMT) that will detail a more confrontational approach to Iran over its nuclear and ballistic missile programs and its financial and military support for extremist groups in the Middle East, U.s. Secretary of State Rex Tillerson told reporters.

Trump will also give the U.S. Treasury Department broad authority to impose economic sanctions against people and entities in the Iranian military, the Iran Revolutionary Guard, in response to what Washington calls its efforts to destabilize and undermine its opponents in the Middle East.

Trump's decision to decertify the nuclear deal will not withdraw the United States from the agreement, which was negotiated by the United States and other world powers during the administration of former President Barack Obama.

Trump will attempt to persuade the U.S. Congress to approve some separate measures to toughen U.S. policy toward Iran.

Tillerson acknowledged the strategy may not work.

"What we are laying out here is this is the pathway we think provides us the best platform from which to attempt to fix this deal," he said. "We may be unsuccessful. We may not be able to fix it. And if we’re not then we may end up out of the deal."

Trump's move will put Washington at odds with other signatories of the accord, which include Britain, France, Germany, Russia, China, the European Union and Iran.

It will add to actions the Trump administration has taken in pursuit of an "America First" approach to international agreements, such as his decision to withdraw from the Paris climate accord and abandoning the Trans-Pacific Partnership trade talks.

The Republican president has been under strong pressure in recent weeks from European leaders and U.S. lawmakers to swallow his concerns and certify the nuclear deal because international inspectors say Iran is in compliance with it.

European officials have categorically ruled out renegotiating the deal, but have said they share Trump's concerns over Iran's destabilizing influence in the Middle East.


The threat of new action from Washington has prompted a public display of unity from the rival factions among Iran's rulers.

Trump, who took office in January, had reluctantly certified the deal twice before and has repeatedly blasted the agreement as "the worst deal ever" and an embarrassment.

His decision will set in motion a 60-day countdown for the U.S. Congress to decide whether to reimpose U.S. economic sanctions on Tehran that were suspended under the agreement.

If Congress reimposed the sanctions, the United States would then be in violation of the terms of the nuclear deal and it would likely fall apart. If Congress does nothing, the deal remains in place.

Tillerson said that rather than reimposing sanctions, Trump wants the Republican-controlled Congress to fix what he considers flaws in the agreement by including some "trigger points" that if crossed by Iran would automatically force U.S. nuclear-related sanctions to go back into place.

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