Judicial Watch president Tom Fitton revealed on Fox News over the weekend the FBI has refused to turn over additional text messages related to two anti-Trump employees and senior bureau leadership.

Who do the messages belong to?

In recent weeks, the focus of text messages at the FBI have centered around senior agent Peter Strzok and his mistress, FBI lawyer Lisa Page. The two high-ranking bureau employees worked on both the Clinton email investigation and the investigation into Russian interference in the 2016 election, which would become the investigation taken over by special counsel Robert Mueller.

Strzok was removed from Mueller's investigation last summer after the anti-Trump, pro-Clinton messages were discovered.

But according to Fitton, the messages the FBI doesn't want to turn over don't belong to either Strzok or Page. He told Fox News host Jeanine Pirro the messages belong to the FBI's number two man, deputy director Andrew McCabe.

"If [Attorney General Jeff] Sessions were serious about this...he'd recognize that this is just the tip of the iceberg. He should send the U.S. Marshals in over to the FBI and to secure the evidence here," Fitton said. "Because there are other text messages here that have yet to be turned over to Congress."

"We knew there were text messages to be had. We sued back in September for the text messages of the number two at the FBI, Andrew McCabe. And they just told us this week they gave us everything they were gonna give us and not one text message was turned over," Fitton explained. "Have they lost Andrew McCabe's text messages?"

Fitton went on to explain that what's going on at the Department of Justice almost amounts to "obstruction of justice."

"Jeff Sessions has got to take stronger action here," Fitton said.

Why McCabe?

Fitton didn't explain exactly why Judicial Watch has sought McCabe's text messages.

However, in one very mysterious message between Strzok and Page, the couple referred to a man named "Andy" — who many believe is McCabe — in the same message they referred to an "insurance policy."