The Supreme Court ruled Friday that a controversial ban on TikTok may take effect this weekend, rejecting an appeal from the popular app’s owners that claimed the ban violated the First Amendment.

The decision came a week after the justices heard a First Amendment challenge to a law aimed at the wildly popular short-form video platform used by 170 million Americans that the government fears could be influenced by China.

The Supreme Court on Friday unanimously upheld the federal law banning TikTok beginning Sunday unless it's sold by its China-based parent company, holding that the risk to national security posed by its ties to China overcomes concerns about limiting speech by the app or its 170 million users in the United States.