Ret. U.S. Army Lt. Gen. and National Security Advisor H.R. McMaster breaks down President Donald Trump’s options and thought process in deciding whether direct U.S. involvement is necessary on ‘The Story.’ Ret. U.S. Army Lt. Gen. and National Security Advisor H.R. McMaster breaks down President Donald Trump’s options and thought process in deciding whether direct U.S. involvement is necessary on ‘The Story.’