I don't know what the difference is between a threat and an attempt but just yesterday a U.S. House panel unanimously approved a bill that could ban it. Today Biden said he'd sign the bill it if it passes.
Is this a real statement? As in, ESL possibly?
Someone blustering/threatening to do something is just a bunch of hot air. Enacting legislation and putting into action so that it becomes illegal would be attempting it.
It would only be an attempt, as we've seen how well banning through legislation works with things like Prohibition, War on Drugs, etc. Are they going to force all US ISPs to block it? Are they going to ban it from the stores? Are they going to prevent US users from accessing VPNs from outside US territories? Let's face it, people are addicted to TikTok, and they will find a way to get their fix.