Republican National Committee chairman Reince Priebus on Monday called for an investigation into whether former Secretary of State Hillary Clinton committed perjury by lying under oath about her handling of classified information in her emails.

In an interview with radio host Hugh Hewitt, Priebus argued in favor of a criminal referral by House Republicans to investigate whether Clinton perjured herself when she told the House Select Committee on Benghazi that she never sent or received classified information. FBI Director James Comey told the House Oversight Committee last week that that was not true, as the FBI’s investigation revealed that 110 emails in 52 email chains contained classified material.