The Supreme Court’s remarkably speedy decision Friday to allow a controversial ban on TikTok to take hold will have a dramatic impact on the tens of millions of Americans who visit the app every day and broad political implications for President-elect Donald Trump.

Justices reject the Chinese app’s First Amendment challenge to a federal law against “foreign adversary” control.

The US Supreme Court has upheld a law that bans TikTok nationwide unless its China-based parent company ByteDance sells the platform by this Sunday. TikTok had challenged the law, arguing it would violate free speech protections for the app's more than 170 million users it says it has in the US.