The main purpose of this legislation is to ensure that employees of the United States Capitol Police continue to receive their salaries even during periods when the government faces a shutdown due to a lack of discretionary funding. This aims to provide financial stability for these employees, who play a crucial role in maintaining security and order at the Capitol. Key provisions of the legislation include the allocation of necessary funds from the U.S. Treasury to cover the salaries and expenses of Capitol Police employees during any lapse in government appropriations.