Sen. Dick Durbin, now the ranking Democrat on the Judiciary Committee, has handled classified material many times during his 40 years in Washington. He said he's "concerned" about Joe Biden's apparent mishandling of it.

But Durbin also said he's concerned about the "endless investigations" promised by "MAGA Republicans" who now control the House of Representatives.

"Well, I'm concerned," Durbin told CNN's "State of the Union" on Sunday. He was talking about the additional classified documents found at Biden's Wilmington home on Friday, during a 13-hour search by the FBI. This was the fifth such discovery.

"There's a standard that we follow when it comes to members of Congress and classified information," Durbin said:

"The door to my office is closed. The person who presents the document to me takes it out of a locked briefcase, hands it to me and watches as I read it, when I finish reading it, and he takes it back and puts it in the briefcase and leaves the scene.

"I mean, that's how carefully we review these documents. To think that any of them ended up in boxes in storage one place or the other is just unacceptable.