Michael Thomas McCaul, Sr. (born January 14, 1962) is the U.S. Representative for Texas's 10th congressional district, serving since 2005. Since the beginning of the 113th Congress, he has been the Chairman of the House Committee on Homeland Security. He is a member of the Republican Party. The district stretches from Austin to Houston. As of 2015 he is the second wealthiest member of Congress.