Correct, except by law tx might not have any other options.
Currently illegals get processed and get a plane or bus ticket to anywhere in the US.
At least if the state of tx intercepts the illegals from ice processing to on their way to the bus or train station they can be funneled to DC.
I don't recall under what pretense they could do it, but I believe it was on Beck this morning they were saying that states could proclaim this an invasion and actively protect their own borders.