They cannot take down a domain registered with a registry and registrar outside their jurisdiction. They could try and compel domestic DNS providers to block queries for that domain, but there are numerous providers who are unlikely to comply with that request on grounds of the 1st amendment.
Given that the OP is about TikTok (a foreign website) being blocked in the United States, your point has very little relevance here. Further, if the website was hosted stateside they could just physically seize the servers themselves.
False, feds have taken down whole domains for violations
They cannot take down a domain registered with a registry and registrar outside their jurisdiction. They could try and compel domestic DNS providers to block queries for that domain, but there are numerous providers who are unlikely to comply with that request on grounds of the 1st amendment.
Given that the OP is about TikTok (a foreign website) being blocked in the United States, your point has very little relevance here. Further, if the website was hosted stateside they could just physically seize the servers themselves.
They have servers here otherwise it would be a laggy mess to use tiktok