Attorney General Jeff Sessions was in the hot seat again yesterday, testifying in front of the House Judiciary Committee about a meeting he had with George Papadopoulos.

And as he did during his last testimony, Sessions struggled to remember important details.

“If he doesn’t remember that, he’s not mentally fit to be the attorney general,” said national security expert Juliette Kayyem on BPR today. “How could you not remember this?”

Papadopoulos, a Trump surrogate, told Sessions he had ties to Russia and said he could set up a meeting between then-candidate Trump and Russian President Vladimir Putin.

During the hearing, Sessions said he had “no clear recollection of the details of what he said,” but he seemed confident that he “pushed back against” Papadopulos.

“It is inconsistent to not remember a lot of meetings, a lot of things that were said, a lot of access with the Russians, but to specifically remember the one thing that might benefit the narrative in any future criminal investigation,” said Kayyem.

Kayyem called Sessions’ testimony “bizarre” and said the attorney general should have dissuaded Papadopoulos himself from meeting with the Russians.

“The more interesting thing is that he did not tell him, ‘Don’t meet with the Russians,’” she said.

Sessions has come under fire for his faulty memory in the past. He testified during his confirmation hearing that he’d had no contact with the Russians during the campaign, but he had actually met twice with the Russian ambassador. He also testified last month that Trump surrogates hadn’t had contact with the Russians, until news reports revealed Carter Paige and George Papadopoulos had.

For Kayyem, the explanation for Sessions’ failure to recall the details is simple:

“I think the truth is that he was not honest under oath,” she said. “He’s choosing between perjury and what probably is underneath it.”

National security expert Juliette Kayyem joins us every week. She is the CEO of ZEMCAR, a member of the faculty of the Kennedy School and a CNN and WGBH contributor. To hear her interview in its entirety, click on the audio player above.