July 7, 2010 11:55AM 

# Feds Challenge Arizona Immigration Law 

By [Tim Lynch](https://www.cato.org/people/tim-lynch) 

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Yesterday, the Obama administration filed a lawsuit [challenging the constitutionality](http://www.washingtonpost.com/wp-dyn/content/article/2010/07/06/AR2010070601928.html) of Arizona’s recently enacted law that is designed to curb illegal immigration. The Arizona law has not yet taken effect — that will occur on July 29. To generate more discussion and debate, Cato will be hosting a [policy forum](https://www.cato.org/event.php?eventid=7334) on the legal challenge and related issues on July 21. If the [weather in DC](http://www.washingtonpost.com/wp-dyn/content/article/2010/07/06/AR2010070602773.html) continues to cooperate, it will feel like we are actually in Arizona.

Go [here](https://www.cato.org/immigration) for Cato work related to immigration policy.

##### Related Tags 

[Constitutional Law](https://www.cato.org/constitutional-law), [Trade Policy](https://www.cato.org/trade-policy), [Herbert A. Stiefel Center for Trade Policy Studies](https://www.cato.org/herbert-stiefel-center-trade-policy-studies), [Robert A. Levy Center for Constitutional Studies](https://www.cato.org/robert-levy-center-constitutional-studies) 

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