Over the weekend the Iranian regime executed Shahram Amiri, an Iranian nuclear scientist who was convicted of spying on behalf of the United States.

Shahram Amiri defected to the U.S. in order to thwart Iran’s nuclear program. When he returned in 2010, he was welcomed with flowers by his government’s leaders and even went on an Iranian talk-show circuit before mysteriously disappearing.

In July when FBI Director James Comey announced charges would not be brought against Clinton for storing top secret, classified information on a private email server, but he implied a hack was likely to have occurred based on the extreme lack of security on the private email server.

Details on how Amiri was exposed as a spy are still unclear, but according to Kentucky Senator Tom Cotton, Amiri’s name was mentioned multiple times in emails by Hillary Clinton on her unsecured email server.

Cotton said during an interview on CBS News’ Face The Nation Sunday morning, “I’m not going to comment on what he may or may not have done for the United States government, but in the emails that were on Hillary Clinton’s private server, there were conversations among her senior advisers about this gentleman.”

See Cotton’s full interview below: