No. A support letter is not required by the U.S. Consulates for visitor visa applications. As a visitor to the United States, it is important for you to be aware of visa requirements. Citizens of certain countries that participate in the Visa Waiver Program may come to the United States without a visa if certain conditions are met. Other visitors will need a nonimmigrant visa. We encourage you to visit the U.S. Department of State website to learn about your specific travel requirements. Columbia University will extend an invitation to events like commencement, and as a courtesy will offer a letter of support to assist with your visa application upon request.