"Washington Stakeout": previous examples of asking politicians tough questions
The website "Washington Stakeout" (link, video compilation here) has several videos where they ask newsmakers such as Pat Leahy somewhat tough questions. They're all from the leftwing perspective and involve impeachment, the Iraq war, and so on. However, they might serve as a bit of an example of how to do things if anyone wants to ask very tough questions about immigration or related matters. Unfortunately, they stopped around April 2007 for an unknown reason; the questioner (Sam Husseini) is now with the Institute for Public Accuracy (accuracy.org).