Washington, June 2 -- US Secretary of State Marco Rubio today said that there were signs Iran's new supreme leader, Mojtaba Khamenei, was becoming increasingly involved in negotiations with Washington, despite not having appeared publicly since taking office.

Appearing before lawmakers in back-to-back hearings on Capitol Hill, Rubio suggested that Khamenei was participating in the decision-making process through written communications and intermediaries.

"I think there are indications out there that he is increasingly engaging at some level," Rubio said. "Although all of his communications have been in writing and through intermediaries."He further acknowledged widespread questions surrounding Khamenei's absence from public life, linking ...