Is President Joe Biden "banning switchblades alongside semi-automatic rifles in the coming months as a result of the recent mass shootings"? No, that's not true: The tweet making the claim is fake and was never posted by the account shown.
The claim appeared in an Instagram post on June 13, 2022. It opens:
It's looking likely that Biden will be banning switchblades alongside semi-automatic rifles in the coming months as a result of the recent mass shootings. This is outrageous and unacceptable. Go to tacblades.com to get a switchblade before they are banned and help fight against our tyrannical government!
They are selling out quick. Act fast.
This is what the post looked like on Instagram at the time of writing:
(Source: Instagram screenshot taken on Tue June 14 15:12:44 2022 UTC)
If posted with the exact wording as shared on Instagram, it would be 70+ characters over the tweet limit, per Twitter. The "tweet" appeared to be a clickbait attempt to attract attention to a retail knife website. It purports to be from TBC News with the handle @CnewsTb. That account is a parody account, as seen in the screenshot below, and never posted that tweet:
(Source: Twitter screenshot taken on Tue June 14 17:22:15 2022 UTC)
A search of "CnewsTb switchblade" on Twitter turns up zero results:
(Source: Twitter screenshot taken on Tue June 14 17:27:33 2022 UTC)