Mudde and Rovira Kaltwasser argued that "populism is essentially democratic, but at odds with "liberal" democracy," since populism is based on putting into effect "the will of the people". It is therefore majoritarian in nature, and opposed to the safeguarding of minority rights, which is a defining feature of liberal democracy. Populism also undermines the tenets of liberal democracy by rejecting notions of pluralism and the idea that anything, including constitutional limits, should constrain the "general will" of "the people". In this, populist governance can lead to what the liberal philosopher John Stuart Mill described as the "tyranny of the majority".