simply -- it's like declaring war. arizona can't declare war in mexico. that's a federal responsibility. same thing with immigration. that's the theory behind the lawsuit. >> okay. for more on the implications of this legal showdown, let's go to cnn's casey wian. here's the deal, we have a challenge from the federal government. now the state of arizona gets to respond. what's the state planning to do here? >> reporter: the state of arizona is clearly going to fight this lawsuit, and they say they're going to continue to go ahead and try to implement this legislation. governor jan brewer sent out a tweet yesterday, immediately after the federal government announced their lawsuit, saying that we will continue to enforce or we will try to enforce the immigration laws, because obama won't do it to paraphrase her tweet. the az post, which is the police officer standard and trainings board in arizona, they're moving ahead with the training video that they have released last week that basically says to all the law enforcement officers the