Ben Carson, foreign policy expert.
Faced with increasing scrutiny about whether Mr. Carson — who leads in some Republican presidential polls — was capable of leading American foreign policy, two of his top advisers said in interviews with The New York Times that he had struggled to master the intricacies of the Middle East and national security and that intense tutoring was having little effect.
“Nobody has been able to sit down with him and have him get one iota of intelligent information about the Middle East,” Duane R. Clarridge, a top adviser to Mr. Carson on terrorism and national security, said in an interview. He also said Mr. Carson needed weekly conference calls briefing him on foreign policy so “we can make him smart.”
This week, Mr. Carson’s advisers said that his source for claiming Chinese involvement in Syria was a telephone conversation he had had with a freelance American intelligence operative in Iraq.
According to notes of the briefing kept by a Carson aide who was also on the line, the operative had said, “Multiple reports have surfaced that Chinese military advisers are on the ground in Syria, operating with Russian special operations personnel.”
Mr. Clarridge, a former C.I.A. agent who had connected Mr. Carson with the operative in Iraq, said on Monday that the information was wrong. The operative in Iraq had “overleaped” in suggesting Chinese troops are in Syria, Mr. Clarridge said, adding of the operative, “You know how it goes when people are desperate for some headline.”
Mr. Williams, one of Mr. Carson’s closest friends, who does not have an official role in the campaign, also lamented the Fox News interview. “He’s been briefed on it so many times,” he said. “I guess he just froze.”
Mr. Carson, 64, who retired as one the world’s foremost pediatric neurosurgeons, has sometimes struggled to adapt his thoughtful manner and speaking style to the rat-a-tat of debates and TV interviews. “Sometimes he overthinks things,” Mr. Williams said, adding that he spoke to Mr. Carson after the Fox News stumble. “I could tell, talking to him, it was a bummer for him.”