DACA and the state AGs

Are the AGs suing Trump on behalf of DACA beneficiaries arguing that immigration enforcement is discriminatory because Latinos (and Mexicans in particular) primarily violate the US immigration laws and therefore enforcement targets primarily Latinos (and Mexicans in particular)? Is this the Arpaio issue expanded?

Obama authorized DACA.  Latinos primarily subscribed.  Therefore, rescission or expiration of DACA is discrimination against Latinos?

Was DACA racially/ethnically motivated to begin with.  To confer a benefit to a specific identity group? To curry political favor from that group?