DACA recipients are illegal under federal law. “DACA” is illegal.
If he continues to break his promise there will be a "Dump Trump" sticker there.
It wasn't challenged in the courts. The USG issued official ID cards. DACA has been rescinded and now phased out. It is not illegal in terms of enforcement. The recipients have been issued work permits and SSNs.
Obama took an unconstitutional action but he was not challenged in the courts. Hence, it is not illegal.