FOSTA and SESTA are U.S. Senate and House bills which became law on April 11, 2018. They clarify the country's sex trafficking law to make it illegal to knowingly assist, facilitate, or support sex trafficking, and amend the Section 230 safe harbors of the Communications Decency Act to exclude enforcement of federal or state sex trafficking laws from its immunity. Senate sponsor Rob Portman had previously led an investigation into the online classifieds service Backpage, and argued that Section 230 was protecting its "unscrupulous business practices" and was not designed to provide immunity to websites that facilitate sex trafficking.