WeChat hearing held in San Francisco, Judge expected issue ruling later today

FILE - In this photo illustration the Chinese multi-purpose messaging social media and mobile payment app developed by Tencent, WeChat logo is seen on an Android mobile device with United States of America flag in the background. (Budrul Chukrut/SOPA Images/LightRocket via Getty Images)

In a rare Saturday afternoon hearing, a federal judge in San Francisco heard a motion by a WeChat user group and six WeChat users hoping to block President Donald Trump's executive order limiting the messaging app in the United States.

In comments during the hearing in U.S. District Court, Magistrate Judge Laurel Beeler expressed her concern that the order was a burden on protected speech of WeChat users in the United States. While the government had identified significant national security interests for its action, the order was not "narrowly tailored" to protecting those interests, Beeler said.

WeChat began in China as a messaging app and over the years has added additional functionality including calling, video conferencing, and in-app payments. Because of the many functions integrated within the app, plaintiffs describe it as a "super-app".

WeChat is estimated to have more than a billion users worldwide, including 19 million in the United States, according to plaintiffs' complaint.

The government contends the app is used by the Chinese government for surveillance and data collection within the United States and that the order was a justified exercise of the president's national security powers against a "foreign adversary whose hostile acts are undisputed, and whose aspirations for global dominance are undisputed."

The order, as subsequently interpreted by the U.S. Department of Commerce, imposed a number of limitations and prohibitions on WeChat and third parties, including prohibiting new downloads of the WeChat app, stopping the transfer of funds out of the United States, and forbidding the providing of technical services to WeChat by third parties.

The commerce department's interpretation limited the Order to business-to-business transactions not to "WeChat users who use the app for personal communications."

Much of the hearing focused on whether the order amounted to a shutdown of the app.

The plaintiffs contended that by prohibiting third-party services such as web hosting and internet transit services, WeChat will be effectively be shut down, depriving millions of Chinese-speaking Americans of the primary platform they can use to communicate and interact with friends and family in China.

The government disputed that the order amounted to a shutdown, but conceded that the order would likely, over time, to lead to a "deterioration of functionality."

The order is scheduled to take effect at 11:59 p.m. on Sept. 20.

The judge took the matter under advisement and promised to issue her ruling before the end of the day.