Mayor of El Paso refusing to let undocumented immigrant children in Convention cot shelter

When an adult parent is put in prison, the jailers don't throw the children in prison with their parent. The authorities put the children into foster care. In El Paso, Texas, the Mayor is refusing entry to the Convention center cot shelter the migrants who do not have papers, he is leaving out in the cold migrants with no immigration papers, he is leaving their babies and small children out in the cold with the parents. That is wrong. The children should immediately be put into foster care, not punished for illegal immigration by being left out in the freezing cold with their parents. The children did not chose to break any immigration laws. Most of the children are way too young to know anything about immigration laws.
This Mayor of El Paso, Texas is citing federal laws to keep people out of a shelter that has 1,000 cots, and last night fewer than 250 cots were used because he turned away migrants without papers, forced them out to sleep on the streets with below freezing temperatures, forced babies and children who are too little to understand any laws out on the streets.
WHY ISN'T THE MAYOR OF EL PASO, TEXAS BEING CHARGED WITH CHILD ABUSE?
ISN'T IT OBVIOUS THAT CHILD ABUSE LAWS SHOULD PRE-EMPT ANY OTHER LAWS?