Donald Trump’s second term in office is causing great concern about the future of the Liberal International Order. Many observers fear a repetition – or even escalation – of his “America First” policy which saw numerous instances of contestation of international organizations and agreements. This article takes stock of the first Trump Administration’s contestation and its impact on international institutions. Drawing on insights from recent scholarship and a comprehensive dataset of 41 instances of Trump 1.0’s contestation of 24 institutions, it finds that: (1) Trump attacked institutions in various ways; (2) Trump escalated contestation when the US lacked influence within institutions; and (3) the challenged institutions proved largely resilient to Trump’s attacks. International institutions can once again withstand Trump’s attacks when their bureaucracies and powerful member states find the right balance between appeasing Trump and providing alternative leadership.