House Oversight Committee Chairman Darrell Issa (R-Calif.) strongly suggested that Attorney General Eric Holder perjured himself before a congressional panel investigating the Justice Department’s treatment of reporters.

In an interview on CNN’s “State of the Union,” Issa warned Holder not to “use perjury lightly” when discussing his approval of a search warrant for the emails of Fox News reporter James Rosen.

“It’s hard to have confidence in what this attorney general says or what his people say,” Issa said Sunday.

The Justice Department (DOJ) is investigating Rosen for allegedly soliciting classified information from a government source.

DOJ has denied that Holder lied to the House Judiciary Committee when he said that he was never involved in the “potential prosecution of the press for the disclosure of material.”