When asked if he was concerned about the documents, Mulvaney said one thing that caught his attention was that among the list of recovered materials were items labeled Top Secret Sensitive Compartmented Information, or TS/SCI, which requires the highest levels of security clearance.

“That’s the serious stuff,” he said, adding “that’s not supposed to be there.”

“That being said, it’s really hard to understand how it gets there in the first place. These things are not accidentally moved anywhere,” Mulvaney continued. “These documents are marked. They are clearly known to folks to be TS/SCI and there’s supposed to be folks tracking where they are.”