If the Texas National Guard continues to put up barbed wire, following the lawful orders of Gov Abbot, the Biden administration will call them up, putting them under federal control.
This is what happened when Gov. Orville Faubus attempted to use the Arkansas national guard to prevent school integration after the Supreme Court's Brown vs. Board of Education decision.
It will be interesting to see if the ranks adhere to this law, that was widely protested by many governmental branches of many states, but not publicized and basically quashed. That is, if the Feds actually try to enforce it.