WASHINGTON—The U.S. Justice Department on Wednesday asked two federal appeals courts to put on hold government appeals of lower court rulings blocking restrictions the Trump administration imposed on Chinese-owned app TikTok. Under former President Donald Trump, the Commerce Department sought to ban Apple Inc and Alphabet Inc’s Google app stores from offering TikTok for download to new users and to ban other technical transactions TikTok said would effectively bar the app’s use in the United States. Three federal judges in separate rulings blocked Commerce orders on TikTok and for Chinese-owned WeChat. The Justice Department told appeals courts for the District of Columbia and the Third Circuit that the Commerce Department “plans to conduct an evaluation of the underlying record justifying those prohibitions” to determine if they are warranted by the national security threat Trump described. Late Wednesday, the Third Circuit agreed to cancel oral arguments that had been set for …