The main purpose of this legislation is to prevent the President of the United States from filing civil lawsuits against the federal government. The bill aims to clarify the legal boundaries regarding the President's ability to engage in litigation against the government, ensuring that such actions are not permitted. Key provisions of the bill include a clear prohibition on any President filing a civil action against the United States. Additionally, it declares a specific settlement agreement related to a case involving former President Trump and the Internal Revenue Service as void.