Last month, Republica Senator Josh Hawley (along with Senator Ken Buck) introduced a bill to ban TikTok on US devices and prevent commercial activity with TikTok’s parent company, ByteDance.

Hawley’s legislation attempt – while so far dead in the water – isn’t alone, with multiple state and federal agencies taking action against what they see as a security threat, banning the app from state and federal devices.

Now, a Democratic Senator has waded into the fray – Colorado Senator Michael Bennet.

Bennet, a centrist Democratic known for working across the aisle, joins fellow Democratic Representative Raja Krishnamoorthi in endorsing a ban of the Chinese app.

Bennet shared his thoughts in a letter to Apple CEO Tim Cook and Google CEO Sundar Pichai, saying that TikTok is a national security risk.

TikTok clapped back quickly, saying, “Unfortunately, Senator Bennet’s letter relies almost exclusively on misleading reporting about TikTok, the data we collect, and our data security controls. It also ignores the considerable investment we have made … to provide additional assurances to our community about their data security and the integrity of the TikTok platform.”