Basis for it:
Arizona has a MASSIVE problem with illegal aliens crossing the border. They bring drugs, commit rapes and murders, have even invaded peoples' homes and properties. The state has asked the Feds for help and have been denied. They need to get this under control and are doing ot for themselves out of necessity because they're being ignored in their requests for assistance.
What it does:
It allows local law enforcement to ask for proof of citizenship AFTER detaining someone for another crime. When someone is pulled over for speeding, arrested on drug offenses or any other legitimate reason, it adds an ability to request their legal status and hold them while they're looking it up and checking with proper immigration authorities. Keep in mind, this step is AFTER they're already arrested or stopped for other reasons. The law does not allow profiling or requesting legal status without reasonable suspicion or another crime already having taken place. It basically enforces immigration laws that have ALREADY been signed by the past few Presidents but aren't being allowed to be enforced because of the lack of cooperation or action by Federal Immigration authorities. This law allows State and Local law enforcement to do the job that the Feds refuse to do.
The spin from opposition:
Of course, the first argument is crying "racism" because they want to enforce existing immigration laws against a voting block for the Democrat Party. The President has blatantly lied about it, claiming that "people trying to take their daughter out for ice cream will be asked to show papers for no reason but how they look". That's 100% B.S.
Also, this week, the President gave a speech asking for the Hispanic vote and other minority votes. It has some serious racial divisions in his speech. Imagine the reaction is a white President gave a speech asking for the white vote as the key to his victory, excluding other racial groups.
Texas wants the law now too. States have a right to protect themselves, especially when the Federal Government is ENABLING the law breakers.
Texas Rep Wants to Import AZ Immigration Law | NBC Dallas-Fort Worth