Housing pledge driven by responsibility, gratitude, says Microsoft president

Microsoft President and chief legal officer Brad Smith joins CNBC's "Closing Bell" to discuss Microsoft pledge of $500 million to tackle Seattle's housing crisis. The pledge is the largest in the company's 44-year history, and, according to the company, is one of the heftiest contributions by a private corporation to housing. The initiative comes as Microsoft and other tech giants that have driven the region's economic boom face increasing pressure to help mitigate affordable-housing shortages.