TikTok users worry about losing their social media platform, but First Amendment rights are on the line, too.AP Photo/Ted Shaffrey Anupam Chander, Georgetown University and Gautam Hans, Cornell University TikTok, the short-video company with Chinese roots, did the most American thing possible on May 7, 2024: It sued the U.S. government, in the person of Attorney General Merrick Garland, in federal court. The suit claims the federal law that took effect on April 24, 2024, banning TikTok unless it sells itself violates the U.S. Constitution. The law names TikTok and its parent company, ByteDance…