The foreign and domestic enemy clause is also a part of the US Armed Forces oath, which we all take upon successful enlistment. This clause is there because of the Civil War, but to me, it's also a reminder of a constant, vigilant Fifth Column in this nation, known as AIPAC. AIPAC has in fact become the domestic enemy, as they continue to subvert American ME policy, use bully tactics to get Congress to fall in line with racist Israeli policies, (such as the loyalty oath,) and demonize anyone who so much as remotely criticizes Israel.
Iran deal opposition grows among U.S. Republicans, Reuters poll shows (Reuters)
from the article: U.S. Jews and Israel versus Barack Obama