Dems are in a rough spot on this one, it will be hard to attack an action against an app with documented CCP/PLA involvement when they went so hard against FB for their inaction on use of the platform by foreign powers.
Why would they want to defend it? Addictive social media app based in China being forced to go is beneficial for everyone. It's even better if you're not the one removing rights so the blame goes to your political opponent.