Kansas Attorney General Derek Schmidt is urging an appeals court to uphold a federal law giving prosecutors greater authority to take legal action against websites that host sex-trafficking advertisements.

Along with 20 other state attorneys general, he argued the Court should reject a First Amendment free speech challenge to the legislation titled, Allow States and Victims to Fight Online Sex Trafficking Act (FOSTA).

FOSTA was signed into law by President Trump last year. It amended the Communications Decency Act to prevent websites from claiming immunity from criminal and civil actions for hosting sex-trafficking ads.

Several websites have already been shut down or forced to stop accepting them.