The document discusses several aspects of US foreign policy and national security, including: 1) The president has significant authority over foreign policy but is also checked by Congress, which controls funding and must approve treaties and declarations of war. 2) Public opinion generally supports the president during foreign policy crises but turns against prolonged military engagements, especially when casualties rise. 3) Since 9/11, combating terrorism has become a top priority for US foreign policy, but terrorist attacks still pose a serious threat within and beyond US borders.