This week, al-Qaida militants made a rare appearance at an anti-government protest in Yemen, proclaiming that they were at war with the United States. This might sound like jihadi boilerplate, except that it came only days after reports of U.S. missiles struck suspected al Qaida sites in the small country on the tip of the Arabian peninsula. Details are still murky, but if true, those strikes would mark a major escalation in the United States' approach to Yemen. This leads us to ask: is the U.S. fighting a secret war in Yemen? Robert Worth, Middle East correspondent for The New York Times, helps us answer that question. Gregory Johnsen also joins us; he's a Yemen expert at Princeton University