Carson had been offered the job leading the U.S. Department of Housing and Urban Development, a Carson spokesman said on Tuesday.
"After serious discussions with the Trump transition team, I feel that I can make a significant contribution particularly to making our inner cities great for everyone," Carson, a former presidential candidate, wrote on Facebook. "An announcement is forthcoming about my role in helping to make America great again," he added. (Reporting by Susan Heavey Editing by W Simon)