Todd Spangler NY Digital EditorTikTok, the massively popular short-form video app, is in the crosshairs of American policymakers again over its ownership by Chinese internet giant ByteDance.Brendan Carr, a Republican commissioner of the FCC, posted a letter to Apple and Google on Twitter, urging the tech giants to remove TikTok from their respective app stores — calling it “an unacceptable national security risk.”“TikTok is not just another video app. That’s the sheep’s clothing,” Carr, who was appointed to the FCC in 2017 by Donald Trump, said in the tweet Tuesday accompanying the letter.