In this week's special episode of The Beacon, Stephen Walt gives a guest lecture to the Oxford International Relations Society on the topic "Where is US foreign policy going?". Walt is Professor of International Relations at Harvard University and is on the editorial board of Foreign Policy and numerous other International Relations and Security Studies journals. Walt is known for proposing the balance of threat theory, in which states' alliance behaviour is determined by the threat they perceive from other states. States generally balance by allying against a perceived threat, although very weak states are more likely to bandwagon with the rising power in order to protect their own security. This worldview informs Walt's lecture as he begins by talking about US President Donald Trump.