In June 2017, President Donald Trump confirmed that the United States will withdraw from the Paris Agreement. Almost immediately, individual states began to pledge their commitments to the Paris Agreement despite the lack of federal support. This combination of federal withdrawal and state involvement triggers a series of questions surrounding the constitutionality of individual state action in the Paris Agreement. Some scholars have noted that states' involvement with the Paris Agreement may be unconstitutional because it could violate some combination of the Supremacy Clause, the Treaty Clause, and the Compact Clause. This Comment takes a different view, outlining each of these three constitutional hurdles—the Supremacy Clause, the Treaty Clause, and the Compact Clause—and arguing that individual states’ involvement with the Paris Agreement is not violative of the U.S. Constitution.