trump's efforts to shield his staff with absolute immunity. judge brown jackson saying those staffers, quote, work for the people of the united states and they take an oath to protect and defend the constitution of the united states. this particular case involved former white house counsel don mcgahn who refused a congressional subpoena to testify. the justice department has already filed an appeal, but the decision may still have a ripple effect throughout the impeachment process. let's bring in cnn political correspondent sara murray with more on this. sarah, what are the key takeaways from this legal bombshell. >> one of the things the judge made clear in this sweeping ruling is she wasn't just talking about don mcgahn. this could spell trouble for a number of white house officials. her ruling basically says if you are a current official, if you are a former official, if you are an official who worked in the national security sector, none of these people have blanket and excessive and extreme immunity. they could all be potentially