That's a dangerous precedent to set - because then others will jump in and demand knocking other countries (think Cuba, Venezuela, Iran, Syria or any other country on the US sanction list) offline.

IIRC the only cases where this has happened was when a couple of self-proclaimed "bulletproof hosters" were booted off of their uplinks, but even this wasn't a direct partition of the Internet.

That would just result in Verizon customers being unable to access stuff which isn't good either. Their users don't have much say in the matter, and due to internet monopolies in the US, may even be the only option for some people. They literally cannot even vote with their wallet, and thus any type of repercussion to Verizon would mostly be affecting the users.