Since illegal aliens are citizens of other countries, and the State Dept deals with international affairs, the Feds control the fate of illegal aliens.
States should pull illegal alien invaders from their hotel lodging and handcuff them to the handrails of a nearby Fed property. Then instruct officers to arrest anyone who releases the aliens back on state property.
Illegals - deport every single one - the cost of deportation is far less then their upkeep.