This article explores how ASEAN member states can further integrate by reforming their respective constitutions and citizenship laws. It examines how member state’s constitutions have recognised citizenship. Dual citizenship has many benefits to an individual and nation state. Dual citizenship, from an economic and integration perspective eases the restrictions of movement. The ease in movement across international borders enable citizens to engage with other states and their citizens in economic and social activities. The rights of citizens have become a very important part of modern democratic states. Thus, it is examined what ex-press rights have been afforded to the citizens of ASEAN member states through their respective constitutions. In doing so, one only needs to look at how the republic of Slovenia has established their constitution and citizenship laws since becoming independent in 1991, and obtaining full membership to the European Union in 2004. Looking to the European Union and Slovenia, ASEAN and its member states could borrow and transplant legal principles and laws to enhance the integration process and reform their constitutions and citizenship laws.