Three of Ben Carson’s top campaign aides resign following infighting with GOP candidate’s business manager

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(CNN) — Ben Carson’s presidential campaign manager Barry Bennett, deputy campaign manager Lisa Coen and communications director Doug Watts all resigned Thursday, as the retired neurosurgeon continues to struggle in the polls.

Carson was rivaling Donald Trump for the lead in the Republican presidential race in mid-October, but he has since fallen to 10% in the latest CNN/ORC poll, which ties him for a distant third place with Marco Rubio, behind Trump and Ted Cruz.

His campaign has been marked of late by public sniping between Bennett and Watts with Armstrong Williams, Carson’s business manager and sometimes public surrogate who has no official role in the campaign. Williams has criticized Bennett and Watts for not adequately preparing the candidate for public appearances, especially on foreign policy, an issue that has dominated the race in recent months.

Questions about the veracity of Carson’s compelling personal story, about his rise out of poverty in Detroit to become perhaps the nation’s most widely known neurosurgeon, have also hounded him as he fell in the polls.

Dr. Ben Carson

Dr. Ben Carson

Bob Dees, a foreign policy adviser to Carson, is now the campaign chairman. Ed Brookover, a senior strategist, will be the new campaign manager, Carson’s National Finance Chairman Dean Parker said on CNN. Carson’s Iowa state director Ryan Rhodes said he will remain with the campaign.

“As we enter a new phase of the campaign cycle, it is necessary to invigorate my campaign with a strategy that more aggressively shares my vision and world-view with the American people,” Carson said in a statement. “I commend Barry Bennett and Doug Watts for their efforts to help me share my vision for America. Over a year ago, hundreds of thousands of Americans encouraged me to listen to the call and seek the office of president of the greatest nation the world has ever known. I am ready to be president and believe that my unique experience and background is what is needed to heal, inspire and revive America.”

Watts, in a statement, said, “we respect the candidate and we have enjoyed helping him go from far back in the field to top tier status,” later adding, “we are proud of our efforts for Dr. Carson and we wish him and his campaign the best of luck.”

Carson’s campaign has raised more than $23 million in the fourth quarter of 2015, his campaign said Wednesday, although it would not say how much cash it has on hand.

Carson last week pushed back against reports a campaign shakeup was imminent, although he did not discount the possibility.

“The key word there is ‘may.’ We’re always going to be looking at it. We’re always going to be evaluating how people are performing” Carson told CNN’s Don Lemon. “No one is ever 100% guaranteed that they’re always going to be there.”

Campaign infighting

Bennett and Watts have been unhappy with Williams’ role with Carson, especially as Williams publicly criticized the campaign’s struggles, such as the Republican Jewish Coalition speech where Carson repeatedly mispronounced the name of Palestinian group Hamas.

“His campaign has to do a better job at preparing him,” Williams said in an interview with CNN earlier this month. “Don’t give him speeches at the last minute. It’s not only on him, it’s on them.”

Responding to those comments, Bennett said of Williams: “I don’t think he is always helpful. You always defend your candidate.”

The resignations were first reported Thursday by the Des Moines Register.