That’s the key. The states *aren’t* enforcing the federal law. The law simply requires that the states turn these people over to the federal government.
The states can’t deport them out of the country, but they *can* send them out of state.
Send them to Washington, DC.
Maryland.
Va.
Anywhere in the DC metro area.
All tied to the federal government.
After declaring that they are an invasion of their state.