Early Sunday, a US judge banned the Commerce Department from asking Apple and Google to remove the Chinese company's WeChat messaging app from their app stores.
American Judge Laurel Piller in San Francisco said that lawsuit users of WeChat "have raised serious questions regarding their rights mentioned in the First Amendment."
The Commerce Department issued an order, citing national security, to ban the app - owned by Tencent Holding - from US app stores.
Biller also suspended the initial trade order that would have prevented further transactions with WeChat in the US, which could have weakened the usability of the site for existing US users.
The US Commerce Department did not immediately comment.
Analytics firm Apptopia said in early August that WeChat has an average of 19 million active daily users in the United States, and that it is popular among Chinese and American students living in China and some Americans who have personal or business relationships in the US. China.
The Justice Ministry said obstructing the matter would override the president's decision on how best to confront threats to national security.
But Piller said, "While the public evidence about the national security threat related to China (in terms of technology and mobile phone technology) is substantial, the specific evidence about WeChat is modest."
It is reported that WeChat is an all-in-one mobile app;
Combining services similar to Facebook, WhatsApp and Instagram, the app is an essential part of the daily life of many in China, with more than a billion users.
The WeChat Users Coalition - who filed the lawsuit - described the ruling as "an important, difficult and hard-fought victory for millions of WeChat users in the United States."
"The United States has never shut down a major communications platform, not even during times of war. There are serious problems with the First Amendment with the WeChat ban, which targets the American-Chinese community," said user attorney Michael Bean.