U.S. President Donald Trump said Iran negotiators made a “significant proposal, a significant step” following the ultimatum he issued on Easter Sunday.

Axar.az reports, citing Fox News, speaking at the White House Easter, Trump said: "They made a proposal, and it's a significant proposal, a significant step"..."It's not good enough, but it's a very significant step."

He added that Iran is currently negotiating and reiterated that the U.S. will evaluate the developments as they unfold.

"They are negotiating now. And they have made a very significant step. We'll see what happens," he continued.

Trump also stressed that Iran must not possess nuclear weapons, and Tuesday deadline he set for Iran to reach a deal is firm.