Former Vice President Biden said on Thursday that outgoing White House staff secretary Rob Porter should not have been working in the White House for as long as he did amid abuse allegations from his two ex-wives. 

"I can't explain it. It's long past due that he left. I understand he's departed. If you just look at it from a perspective of one thing, the FBI didn't think he should get a security clearance," Biden told MSNBC's Andrea Mitchell on "Mitchell Reports."

"The culture's changing, thank God, but not fast enough, and the idea that this would happen in the Oval Office," he continued.  

He acknowledged that President TrumpDonald John TrumpTrump: 'I don't trust everybody in the White House' JPMorgan CEO withdraws from Saudi conference Trump defends family separations at border MORE might not have known about the allegations, although CNN has reported that the FBI informed top White House staff months ago.

He added that the current White House seems barely "functional" in its inability to manage sensitive situations.

"Now, I don't know, I heard on the way, I was briefed on the way in that, when the president found out about it, he said go. So if that's the case that if the president never knew about it, good for the president," Biden said. But he later noted that Trump is a "loose cannon" and "not credible." 

The White House is facing backlash after Porter's two ex-wives, Colbie Holderness and Jennifer Willoughby, told The Daily Mail that they went through physical and emotional abuse when they were married to Porter. 

CBS News also reported Wednesday that the FBI was aware Willoughby obtained a temporary protective order against Porter in 2010.

Porter has called the allegations "outrageous" and "simply false." 

White House press secretary Sarah Huckabee Sanders announced Porter's resignation on Wednesday, although he is still working there during the transition.

Chief of staff John Kelly, who originally defended Porter, said he was shocked by the claims after photos surfaced of one of the women. 

"I was shocked by the new allegations released today against Rob Porter. There is no place for domestic violence in our society,” Kelly said in a statement.