Ben Carson Is Struggling to Grasp Foreign Policy, Advisers Say

...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 that he had struggled to master the intricacies of the Middle East and national security and that intense tutoring was having little effect...
http://www.nytimes.com/2015/11/18/us/politics/ben-carson-is-struggling-to-grasp-foreign-policy-advisers-say.html?_r=0