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Ben Carson speaks in Phoenix, Arizona

Republican presidential candidate Ben Carson delivers a speech to supporters Tuesday, Aug. 18, 2015, in Phoenix. The state Republican Party says Tuesday evening's rally was moved from a church in Tempe to the convention center because of high demand. (AP Photo/Ross D. Franklin) Republican presidential candidate Ben Carson delivers a speech to supporters Tuesday, Aug. 18, 2015, in Phoenix. The state Republican Party said Tuesday evening's rally was moved from a church in Tempe to the convention center because of high demand. (AP Photo/Ross D. Franklin) Republican presidential candidate Ben Carson delivers a speech to supporters Tuesday, Aug. 18, 2015, in Phoenix. The state Republican Party says Tuesday evening's rally was moved from a church in Tempe to the convention center because of high demand. (AP Photo/Ross D. Franklin) Supporters cheer on Republican presidential candidate Ben Carson as he delivers a speech Tuesday, Aug. 18, 2015, in Phoenix. (AP Photo/Ross D. Franklin) Republican presidential candidate Dr. Ben Carson delivers a speech to supporters Tuesday, Aug. 18, 2015, in Phoenix. (AP Photo/Ross D. Franklin) Republican presidential candidate Dr. Ben Carson, left, waves to supporters along with his wife Candy Carson, after the candidate spoke at a rally Tuesday, Aug. 18, 2015, in Phoenix. (AP Photo/Ross D. Franklin) Republican presidential candidate Dr. Ben Carson delivers a speech to supporters Tuesday, Aug. 18, 2015, in Phoenix. (AP Photo/Ross D. Franklin) Republican presidential candidate Dr. Ben Carson delivers a speech at a rally to supporters Tuesday, Aug. 18, 2015, in Phoenix. (AP Photo/Ross D. Franklin) Republican presidential candidate Dr. Ben Carson paces the stage as he speaks to supporters at a rally Tuesday, Aug. 18, 2015, in Phoenix. (AP Photo/Ross D. Franklin) Republican presidential candidate Dr. Ben Carson delivers a speech to supporters Tuesday, Aug. 18, 2015, in Phoenix. (AP Photo/Ross D. Franklin) Republican presidential candidate Dr. Ben Carson, left, laughs as he wife, Candy Carson, waves to the crowd after saying a few words to the crowd supporting her husband in front of supporters Tuesday, Aug. 18, 2015, in Phoenix. (AP Photo/Ross D. Franklin) Republican presidential candidate Dr. Ben Carson shakes hands with supporters after delivering a speech Tuesday, Aug. 18, 2015, in Phoenix. (AP Photo/Ross D. Franklin) Supporters cheer on Republican presidential candidate Dr. Ben Carson as he delivers a speech Tuesday, Aug. 18, 2015, in Phoenix. (AP Photo/Ross D. Franklin)