Gulf countries are now fundamentally reassessing their security strategies, including how they partner with the United States. Amid political backlash to the war in the United States, Washington is also likely to recalibrate its presence in the region. The unraveling of the Gulf security bargainThe idea of the US as a security guarantor in the Gulf has long relied on a combination of strategic ambiguity and implicit assumptions rather than formal security guarantees. As Obama and his predecessors signaled a “pivot to Asia,” Gulf countries worried that the US was deprioritizing Gulf security. Now, they should learn from those lessons to help usher in a new era for US-Gulf security partnerships.