always. we learned that the trump administration plans to launch major mexico crackdown this weekend. i.c.e. planning raids in as many as ten cities. targeting undocumented family members. tonight, some cities are urging, if i.c.e. comes knocking, do not open your door. here's mary bruce. >> reporter: tonight, immigration and customs enforcement is preparing a mass roundup of migrant families that have already received deportation orders. predawn raids, reportedly known as "family op" planned for this sunday in as many as ten major cities. the director of i.c.e. speaking on abc news live. >> one of the greatest pull factors for families to come here is they know that once they arrive in the united states, they remain here untouched. we have to change that message. >> reporter: these kinds of raids typically target criminals, not families. houston's police chief sounding a warning. >> the last thing we need is to evoke that kind of fear where people go further into the shadows and fail to cooperate with law enforcement at the local level.