Biden administration climate envoy John Kerry is facing criticism for comments he allegedly made to an Iranian diplomat about Israel’s operations in Syria. The former secretary of state denies the conversation ever happened. 

An audiotape of Iranian Foreign Minister Mohammad Javad Zarif leaked April 25. In the recording, Zarif said Kerry told him that Israel had attacked Iran’s assets in Syria at least 200 times, The New York Times reported. 

The outlet did not mention when exactly the conversation purportedly took place. Kerry served as secretary of state under President Barack Obama from 2013 to 2017 and worked on the 2015 nuclear deal with Iran. Zarif’s comments referred to regular Israeli airstrikes against Iranian military targets in Syria. 

"If true, this reporting is incredibly concerning,” said Rep. Michael McCaul of Texas, the top Republican on the House Foreign Affairs Committee in a tweet Monday.  “I already had significant concerns about Secretary Kerry serving as the climate envoy, but reportedly relaying sensitive information to the number one state sponsor of terrorism is just unfathomable.”