The Justice Department faced a 2:30 p.m. EDT (1830 GMT) Friday deadline to either delay the ban or oppose TikTok's preliminary injunction. It filed its objection under seal, citing submissions made by TikTok's Chinese owner, ByteDance, that include confidential business information.
ByteDance has said it made a preliminary deal for Walmart Inc and Oracle Corp to take stakes in the short video sharing app, but the exact terms of the agreement remain unclear.
The Commerce Department gave the companies an additional week to finalize a deal before an order banning TikTok from U.S. app stores takes effect, citing "recent positive developments."
U.S. District Judge Carl Nichols in Washington set a 9:30 a.m. EDT Sunday hearing on the preliminary injunction request.
Another U.S. judge, in Pennsylvania, is also considering issuing a preliminary injunction after three TikTok content creators filed suit last week arguing they would "lose access to tens of thousands of potential viewers and creators every month, an effect amplified by the looming threat to close TikTok altogether."
On Sept. 20, a judge in California issued a preliminary injunction that blocked a similar order from taking effect on Tencent Holdings' WeChat app. The Justice Department has asked the judge to allow the ban to take effect pending appeal.
TikTok has said the restrictions, amid rising U.S.-China tensions under the Trump administration, "were not motivated by a genuine national security concern, but rather by political
considerations relating to the upcoming general election."
ByteDance, Walmart and Oracle said last Saturday that their agreement would to allow TikTok to continue to operate in the United States. But U.S. officials have expressed serious concerns that the personal data of as many as 100 million Americans who use the app was being passed on to China's Communist Party government.
ByteDance has said its deal with Oracle and Walmart will see the creation of a standalone U.S. company and does not involve any transfer of technology, though Oracle will be able to inspect TikTok U.S. source code. It has also said the deal needs approval from both China and the United States.
By David Shepardson