“With Kamala you have to put up with a constant amount of soul-destroying criticism and also her own lack of confidence.

“So you’re constantly sort of propping up a bully and it’s not really clear why.”

Gil Duran, who worked for Ms Harris for five months in 2013, when she was the attorney general of California, said Ms Harris was displaying the same “destructive patterns” as in the past.

He said: “One of the things we’ve said in our little text groups among each other is what is the common denominator through all this, and it’s her.

“Who are the next talented people you’re going to bring in and burn through and then have [them] pretend they’re retiring for positive reasons?”

Sean Clegg, who worked for Ms Harris in 2008, when she was the San Francisco district attorney, was supportive.

He said: “I’ve never had an experience in my long history with Kamala where I felt like she was unfair.

“Has she called bulls—? Yes. And does that make people uncomfortable sometimes? Yes.

“But if she were a man with her management style, she would have a TV show called ‘The Apprentice’.”

Many politicians, including Joe Biden are surrounded by members of staff who have worked for them for decades.

But Ms Harris’s history with staff means only two in her current office worked for her before last year.

The White House has said that the recent departures were long planned and not a result of dysfunction in her office.