Constitutional; a constitute lawyer would be just stating he is definitely a lawyer. Constitutionally would means in most phrases regards how constitutional it is.
Therefore Constitutional would be the correct answer.
A constitutional lawyer is a lawyer who studies and focus on the legal interpretation of the governing documents and organization of a state, nation, or sovereignty (For example, like the U.S. Constitution, along with their amendments, and the state and local constitutions) and how those documents relate and affect each other. This type of lawyers may work in cour cases, in law firms, or as solo practitioners.
