Firing Line With Margaret Hoover

Guest: Sen. Tom Cotton (R-AK). Sen. Tom Cotton (R-AK) discusses the escalating tensions with Iran and why he believes a potential military conflict would be swift and decisive for the United States. Cotton, a member of the Senate Select Committee on Intelligence, explains why believes the Mueller report is not "gospel." The 42-year-old senator also talks about his time serving in the Old Guard at Arlington National Cemetery and his new book "Sacred Duty."