A loud minority of Texans call for Independence, which is not really possible as far as I know, BUT could the Rest of the USA just kick another state (Not necessary Texas) out? Or is this also not possible?
If it gets to that point, I think its more likely to declare the state in insurrection or rebellion and send in the army to passify it, rather than trying to expunge it.
There's some pretty valuable infrastructure in TX and many other states. They'd definitely take it back and give the idiots who are responsible for the trouble a token fine and gentle slap on the wrist. It's an American tradition. They'll probably execute the derps doing the actual funding though.