TikTok shut down its app for its US users on Saturday.Michael M. Santiago/Getty ImagesTikTok says it is "restoring service" in the United States.The company had turned off its app for its 170 million US users on Saturday.President-elect Donald Trump said he will issue an executive order on Monday to delay a TikTok ban.TikTok said on Sunday it is "restoring service" after shutting down its app in the United States to comply with a divest-or-ban law.The app began coming back online for US users first through web browsers and later on the mobile app.