Why is the EU so inefficient in securing compliance with rule of law by backsliding member states?

The panoply of EU instruments to deal with actual or potential rule of law breaches in member states is really large. Yet, the EU has been unable to secure compliance. I argue that beyond factors associated with the institutional design for enforcing compliance, the EU relies on a premise that creates a compliance dilemma: being a “community of law”, why authorities that precisely challenge the authority of law would comply with it? I will also explore some of the implications of this dilemma and discuss some of the challenges that poses in terms of future EU constitutional development.