Act of 1963 is a United States federal law amending the Fair Labor Standards Act, aimed at abolishing wage disparity based on sex. ... The law provides (in part) that: No employer having employees subject to any provisions of this section [section 206 of title 29 of the United States Code] shall discriminate, within any establishment in which such employees are employed, between employees on the basis of sex by paying wages to employees in such establishment at a rate less than the rate at which he pays wages to employees of the opposite sex in such establishment for equal work on jobs[,] the performance of which requires equal skill, effort, and responsibility, and which are performed under similar working conditions, except where such payment is made pursuant to (i) a seniority system; (ii) a merit system; (iii) a system which measures earnings by quantity or quality of production; or (iv) a differential based on any other factor other than sex [ . . . . ] So... what Rubio is complaining about is that women, who, famously because of Ledbetter, were not able to get any form of redress if an employer cheated them for years or decades, now have the ability to do so. He is claiming outright that the only effect the Ledbetter Act will have is to line the pockets of trial lawyers. Hmm, let's see. Before the Ledbetter Act, it was already illegal to discriminate, but if the employee found out, then there was, according