The author and title confuse the issue at hand. The subject, a US citizen, travelled abroad under his own free will. The Due Process Clause of the Constitution

The author and title confuse the issue at hand. The subject, a US citizen, travelled abroad under his own free will. The Due Process Clause of the Constitution only applies domestically. Had the FBI detained him on US soil and rendered him to foreign entities, that would trigger due process scrutiny. Being that he was already in Somalia, the FBI can coordinate with host countries (and intelligence agencies) to interrogate individuals. Not only is the FBI not obligated to return him to the US, it's by no means obvious that they can forcibly extradite, even if they had wanted him returned to the US. Sure - they could request (as the State Department and FBI do all the time) - but that's a different issue. Disclaimer: I'm not saying it's good, just that the issues (and therefore the author's conclusions) are presented inaccurately.