President Recep Tayyip Erdoğan told his Iranian counterpart Hassan Rouhani that he sees the United States' withdrawal from the Iran nuclear deal as "wrong."

In a phone conversation on Thursday, Erdoğan and Rouhani discussed the nuclear deal and agreed that they are in favor of maintaining the agreement.

On Tuesday, U.S. President Donald Trump withdrew his country from the landmark nuclear deal, which was signed in 2015 between Iran and the P5+1 group of nations (the five permanent members of the U.N. Security Council plus Germany).

Acting ahead of a May 12 deadline, Trump opted not to extend sanctions relief on Iran, re-imposing nuclear-related economic penalties on the Islamic republic.

The 2015 deal had placed unprecedented restrictions on Iran's nuclear program in exchange for billions of dollars in sanctions relief.

Trump had roundly criticized the agreement in 2016 during his electoral campaign, calling it the "worst deal" he had ever seen.

Other members of the P5+1, for their part, say the agreement in its current form represents the best way to reign in Iran's nuclear program.

Trump's move has sparked a range of reactions, with some countries welcoming it and others condemning it.

The Turkish and Iranian leaders also discussed improving bilateral economic relations, the sources said.