The RNC and DNC warn against it
https://www.cnn.com/2020/07/10/politics/dnc-warning-tiktok/i...
The House voted a 336-71 to bar usage on government-issued devices
https://www.politico.com/news/2020/07/20/house-tiktok-federa...
Seems to me there's strong, bipartisan backing.