This question asks why Trump would be blocked from ending DACA, and the answer was that he wasn't - it was just suspended until all ongoing lawsuits against Trump's action were resolved, presumably to preserve the status quo and avoid any unreversible actions. However, it doesn't address why there are lawsuits against ending DACA in the first place.
On what grounds is the administration being sued to prevent DACA from being ended? What justification do people provide to prevent an executive order from undoing an executive order?