Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: Washington (CNN) A bad day for the White House could turn out to be a good day for justice and democratic accountability and institutions. Robert Mueller's appointment Wednesday as special counsel to probe Russian election meddling and any collusion by Trump campaign aides elevates the investigation clear of partisanship and the threat of White House interference. It therefore may offer the best chance for a politically bulletproof accounting of the guilt or innocence of members of the President's inner circle. Deputy Attorney General Rod Rosenstein's decision to opt for a special counsel is also an antidote to fears that the US political system still has the capacity to investigate itself and its most powerful players.Trump fired Comey last weekA special counsel was appointed Wednesday 
 Question:Wednesday's announcement might also be remembered as the moment that the norms that apply to other politicians finally also ensnared _.

Trump