May reaffirmed Britain’s support for the nuclear deal insisting it was “the best way of preventing Iran from developing a nuclear weapon” | Pool photo by Christopher Furlong/Getty Images May challenges Trump over Iran nuclear deal fallout She also raised concerns about the effect on British firms from his decision to reimpose sanctions on the regime in Tehran.

LONDON — U.K. Prime Minister Theresa May “raised the potential impact of U.S. sanctions on those firms which are currently conducting business in Iran” in a phone call with U.S. President Donald Trump on Friday.

Earlier this week, Trump decided to abandon what he called a “rotten” agreement. Trump reinstated all previous U.S. nuclear-related sanctions against Iran, without regard to European companies that struck business deals in the country on the belief that the nuclear agreement was accepted international policy.

May reaffirmed Britain’s support for the deal alongside France, Germany and the European Union, insisting it was “the best way of preventing Iran from developing a nuclear weapon,” according to a readout of the phone call.

She also raised concerns about the effect on British firms from his decision to scrap the deal and reimpose sanctions on the regime in Tehran.

The two leaders agreed further talks would take place between the U.K. and U.S. on the issue, the spokesperson added.

On the call, May also congratulated Trump on the safe return of three U.S. citizens who had been held in prison in North Korea and welcomed the upcoming peace summit with Kim Jong-un in Singapore.

Both also leaders condemned the Iranian rocket attacks against Israeli forces earlier this week, and “strongly supported Israel’s right to defend itself,” the spokesperson said.

To end the call, May and Trump said they were “looking forward to the U.S. president’s visit to the U.K. in July.”