> That's a bit inaccurate. Prosecutors have legal discretion on a case-by-case basis, but a President not enforcing large sections of the law has never been tested...what happens when the next President decides not to enforce the laws they don't like?

That's a bit inaccurate as well. Reagan and his administration were fairly open that they were not going to enforce sections of law as well, and in the same area, labor law. Particularly with directives sent to the Department of Labor's Occupational Safety and Health Administration.

http://www.nytimes.com/1984/06/09/opinion/looking-for-loopho...

The idea that Reagan was enforcing OSHA labor laws, but that Obama is not enforcing immigration labor laws, is a bit hard to swallow.