"It has been my greatest privilege in life to swear an oath to protect and defend the Constitution of the United States, beginning with my enlistment in the Navy and continuing through my service in the United States Senate," McCain said in a statement. "Each time I have raised my right hand, I do so with enormous weight of the people who elected me to serve. I'm grateful to the National Constitution Center for this recognition, and am humbled to join the ranks of so many past Liberty Medal recipients I greatly admire."