The main purpose of this legislation, known as the "No Sanctuary Cities Act of 2026," is to enhance and clarify the requirements for information sharing between state and local governments and federal immigration authorities. It aims to prevent state and local policies that limit or obstruct this sharing of information, which is crucial for enforcing immigration laws. Key provisions of the legislation include a clear definition of what constitutes information that must be shared, such as an individual's immigration status, custody status, and scheduled release dates.