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

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 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.