LIVE: Sen. Markwayne Mullin testifies before Senate in DHS secretary confirmation hearing

Sen. Markwayne Mullin, nominated by President Donald Trump to lead the U.S. Department of Homeland Security, testifies before the U.S. Senate Homeland Security and Governmental Affairs Committee during his confirmation hearing Wednesday. Lawmakers are expected to question Mullin on his priorities for the department. For more context and news coverage of the most important stories of our day, click here: https://www.nbcnews.com » Subscribe to NBC News: http://nbcnews.to/SubscribeToNBC » Subscribe to Here's t ...