"I'm sometimes asked why it is that for 30 years we seem to have trouble in the United States enforcing the rules against illegal immigration, and I'll tell you what the answer is. The answer is that when the television cameras turn off and the spotlight moves to something else, there are a host of interest groups and advocacy groups who work very, very hard to make it difficult to enforce these rules. I'm not commenting adversely on their motivation, but I can tell you the effect of all of this is to wear down the ability of an agency to enforce the law."