Dr. Ben Carson through the years

Republican presidential hopeful Ben Carson tours the Iowa State Fair.

Republican presidential hopeful Ben Carson speaks during the Iowa State Fair.

Republican presidential candidate Ben Carson speaks during a campaign rally at the Anaheim Convention Center.

Ben Carson, fourth from left, at a 2015 Republican presidential debate with fellow candidates John Kasich, Carly Fiorina, Marco Rubio, Donald Trump, Ted Cruz, Jeb Bush, Chris Christie, and Rand Paul.

Candy Carson and Republican presidential candidate Ben Carson speak during a campaign rally at the Anaheim Convention Center in California.

Republican presidential candidate Ben Carson speaks a campaign rally at the Anaheim Convention Center.

Dr. Ben Carson is introduced to the crowd during the Eagle Forum’s Eagle Council event in St. Louis, Missouri.

Republican presidential candidate Dr. Ben Carson speaks during the Eagle Forum’s Eagle Council event in St. Louis, Missouri.

In this Feb. 21, 2017, file photo, then-Housing and Urban Development Secretary-designate Dr. Ben Carson, listens as President Donald Trump speaks after touring the National Museum of African American History and Culture in Washington.

U.S. Housing and Urban Development Secretary Ben Carson addresses the media outside of The Village at Westerly Creek after touring the HUD funded property in 2018.