His research currently focuses on the political and legal dynamics of state and local immigration regulations, including their constitutionality and their effect on federal immigration lawmaking. He has also extensively explored the relationship between the Second Amendment and noncitizens, as a way of understanding constitutional protections for noncitizens. He is a frequent media commentator on issues of state and local immigration laws, comprehensive immigration reform, same-sex marriage, the first amendment, and equality concerns.
