II 116th CONGRESS 1st Session S. 478 IN THE SENATE OF THE UNITED STATES February 13, 2019 Mr. Sanders (for himself, Mrs. Gillibrand , Mr. Merkley , Mr. Booker , and Ms. Harris ) introduced the following bill; which was read twice and referred to the Committee on Finance A BILL To enhance Social Security benefits and ensure the long-term solvency of the Social Security program.