Republicans are raising concerns about President Trump’s plan to “save” TikTok, given the national security concerns that led Congress to pass a forced divestiture bill in the first place. Mr. Trump, who is now floating the idea of partially nationalizing the app, does have the power to extend the suspension of its usage in America for up to 90 days, but that’s only if a sale is being negotiated, which, as of Sunday night, does not appear to be in the cards.