The White House on Monday accused James Comey of giving “false testimony” and suggested the Justice Department look at whether he perjured himself, as Republican lawmakers stepped up pressure on the former FBI director to clarify apparent discrepancies in his public statements to Congress.

“Since the director’s firing, we’ve learned new information about his conduct that only provided further justification for that firing,” White House Press Secretary Sarah Sanders said, citing “false testimony” among her examples.

Asked to clarify whether she thought Comey perjured himself or at least misled Congress, Sanders told Fox News’ John Roberts: “I think that’s something probably for DOJ to look at, not me. I’m not an attorney.”

Sanders, who defended the Comey firing in response to criticism from former chief strategist Steve Bannon, did not specify what testimony she was citing. But the comments came after Sen. Lindsey Graham told Fox News’ Catherine Herridge last week that he wants to bring back Comey to Capitol Hill, over concerns about his statements on the conclusion of the Hillary Clinton email case.

“This doesn’t add up, and I smell a rat here,” Graham, R-S.C., said.

READ MORE: