TikTok plans to sue the Trump administration over the president’s executive order to ban the popular app, according to a report from NPR.

President Trump on Thursday signed an executive order blocking all transactions with ByteDance, the China-based company that owns TikTok, in 45 days.

Trump cited a “national emergency with respect to the information and communications technology and services supply chain” as the reason for the moratorium, escalating a dispute with TikTok that could force an acquisition of some or all of the social app by Microsoft or another company.

NPR reported that TikTok will argue that Trump’s order is unconstitutional. The federal lawsuit will be filed as soon as Tuesday.

Update: The Wall Street Journal reported Saturday that Twitter has had “preliminary talks” with TikTok about a deal involving the app’s U.S. operations.

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