Rishi Sunak, the other Conservative candidate, would seek a longer, stronger Iran Deal and more work to bring more countries into the Abraham Accords.
The announcement comes just hours after the US announced new sanctions against Iran's petroleum trade.
Brett McGurk, the White House coordinator for the Middle East and North Africa, said that reaching a deal with Tehran was now “highly unlikely.”
Their call came on the heel of US President Joe Biden's visit to the Middle East, during which he visited both Israel and Saudi Arabia.
EU High Commissioner for Foreign Affairs Josep Borrell warned that rejecting the deal would "risk a dangerous nuclear crisis, set against the prospect of increased isolation for Iran and its people."
Readers of The Jerusalem Post have their say.
The Iranians haven’t done anything in recent weeks to suggest that they are eager to re-enter the 2015 nuclear deal, said Ned Price.
Diplomacy with the Iranians in 2022 must consider the significant progress they have made in their nuclear program by violating so many of the JCPOA’s obligations
I’ve said it before and I will say it again – whether out in the open or via cloak and dagger, Iran will do whatever Iranian leadership wants to do.
In June, Iran began removing essentially all the agency's monitoring equipment, installed under its 2015 nuclear deal with world powers.