In his September speech to the U.N. General Assembly, President Trump expressed disdain for the Iran deal created under President Obama and noted that the world hadn’t “heard the last of it.”

WASHINGTON — President Trump plans to take a first step Friday toward gutting the Iran nuclear agreement, though aides said he is willing to consider an additional deal that would pressure Tehran to prove it has given up the means to make nuclear weapons.

While Trump will formally announce his decision to back out of the multinational agreement, he 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 he has long criticized, aides said.

Trump faced a Sunday deadline to certify the agreement. Every 90 days, the president must certify that Iran is in compliance of the deal. If Trump decertifies it, it would be despite Secretary of State Rex Tillerson saying Iran has “technically” held up its end of the bargain.

“Let’s see if we can address the deficiencies that exist within this agreement,” Tillerson said in a briefing for reporters.

Tillerson added that “we may be unsuccessful,” and “we may not be able to fix the deal.” He added that Trump himself is “not particularly optimistic” about the prospect.

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The U.S. signed the agreement in 2015 along with Russia, China, Germany, France and Great Britain. The European signatories have have urged Trump to re-certify it and questioned whether Iran would go along with any new provisions.

Under the agreement, the U.S. and allies reduce sanctions on Iran in…