As your U.S. senators, we have been heavily involved in the congressional debate on immigration reform for several years. We have taken a leadership role on this issue because we represent a state that uniquely benefits from the contributions of legal immigrants, but is also uniquely vulnerable to the dangers of illegal immigration. Throughout this process, our principles have been clear and consistent: We must secure our borders, and we cannot encourage illegal behavior through amnesty. Last week, the Bush administration, along with a small group of senators, announced a compromise immigration bill that would take a necessary first step...