Iran’s Foreign Minister Javad Zarif has been summoned before parliament to explain his recent public stroll with U.S. Secretary of State John Kerry, according to a Sunday report by the country’s official IRNA news agency.

On Jan. 14, on the sidelines of ongoing nuclear negotiations, Zarif took a 15-minute walk through the streets of Geneva with Kerry. Now, according to IRNA, 21 Iranian parliamentarians are demanding that Zarif explain his “diplomatic mistake.”

Zarif is representing Iran in negotiations with the so-called “P5+1” global powers — the U.S., Britain, France, Germany, Russia and China.

Zarif and moderate President Hassan Rouhani have faced intense skepticism from Iranian hard-liners — who believe they are making too many concessions to the West in negotiations to limit the scope of Iran’s nuclear program in exchange for the easing of crippling international economic sanctions.

Tehran and Washington broke diplomatic ties after Iran’s 1979 revolution.

(AP)