President Donald Trump signed an executive order Monday aimed at halting the ban against TikTok for 75 days so he can “pursue a resolution” outside of a complete prohibition, a legally dubious maneuver that could test his power to stave off a measure he once championed.

The app’s availability in the U.S. has been thrown into jeopardy over data privacy and national security concerns.

ByteDance now has to show that it’s making significant progress on a deal to sell TikTok to a US-based company.