The world's worst humanitarian crisis is ongoing in Yemen, as the Saudi-led coalition, with the support of the U.S., continues its brutal campaign against the entrenched Houthi rebels. Waleed Alhariri, U.S. director of the Sana'a Center for Strategic Studies, details the military stalemate centered on a Red Sea port, the debate about America's role, and the prospects for peace, with a UN-led conference in Geneva scheduled for early September.