In recent years, there has been a worldwide intensification in the use of investment screening mechanisms. This surge is connected with political re-orientations, the rise of new economic powers, and security concerns. Despite the considerable effects that investment screening may have on international investment and trade, there is hardly any literature examining the consequences to be drawn from relevant WTO rules for investment screening. However, the importance of WTO law for such instruments is substantial not least due to the broad scopes of application of the GATT and GATS agreements....