The briefs, filed a week before oral arguments, offered sharply differing accounts of China’s influence over the site and the role of the First Amendment.

The president-elect backed TikTok in a Truth Social post Friday as he tries to halt the law from taking effect.

The Biden administration suggested that the Supreme Court should reject Donald Trump’s request to delay a law that would ban TikTok in the US if it isn’t sold by its Chinese parent company.