TikTok fights back against Montana ban with lawsuit.

TikTok has filed a federal lawsuit against Montana, challenging the state's new law banning the app statewide, which is set to go into effect on January 1. The lawsuit argues that the ban violates the First Amendment right to free expression and would preempt federal law by intruding upon matters of national concern, including domestic security and foreign affairs. Montana officials have not provided evidence supporting their claim that the app is vulnerable to Chinese government propaganda and espionage. TikTok is negotiating with the Committee on Foreign Investment in the United States on data-security measures that the company hopes will allow it to remain operational in the United States.