ABSTRACT Michael Mezey maintained that all legislatures are vulnerable to executive attempts to aggrandise their power and influence at the expense of parliamentary prerogatives. In democracies, populist leaders are a danger to parliaments. Therefore, I explored the role of populism as a factor in Mezey's explanation of legislative vulnerability using the case of the Israeli parliament during the 37th government. A wave of populism prompted an attempt to create a constitutional revolution that would weaken the already weak parliament. Israel is one example of the role of populism in making legislatures vulnerable to attempts by the executive branch to increase its power, but there are more cases to study to understand the depth of the phenomenon. Thus, as researchers, we should identify the procedures that can help vulnerable parliaments confront populist leaders and their behaviour.