Homeland Insecurity: The FBI arrest of a North Carolina jihadist brings to five the number of ISIS-tied Muslim Americans captured. It's time the president took the terror group's anti-U.S. rants more seriously. The influence that this vicious successor to al-Qaida in Iraq is exerting inside our own borders is clearly growing. Obama must do more to take out its leaders abroad while increasing scrutiny inside our Muslim community to ferret out recruits. Last week, the FBI arrested Donald Ray Morgan on AK-47 and other weapons charges as the North Carolina native tried to re-enter the U.S. from Lebanon, where agents...