See my post 12.
I predicted this many years ago as the Invasion from Mexico amplified.
The Left now believes that ANY impediment to the inflow of non-whites is illegal discrimination, i.e., exclusion.
IOW the very border itself is discriminatory.
Any sensible nation is built on the notion of the first fundamental notion of property rights: exclusion and control by the inhabitants, who are self selecting.
What they are advocating is the abolition of the nation as it’s physical boundaries have to be considered as a violation of the rights of foreigners to ingress at will and occupy our land.
That is what they are saying with this lawsuit, and what they are now testing for the fall elections: abolition of CBP, open borders, no immigration laws whatsoever.
How that would be functionally different from Invasion, I have no idea.
After other SCOTUS decisions unfavorable to the left, the left took the cases again to a lower court and got SCOTUS overruled, believe it or not. Do not be surprised if, losing this case, the left makes still another try, despite the SCOTUS ruling.