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) America is edging ever closer to a new long, national nightmare, given President Donald Trump's explosive response to signs that special counsel Robert Mueller is approaching the epicenter of White House power. The investigation has taken a serious turn in recent days, raising the clear possibility that whether Mueller finds wrongdoing or not, a period of political stress and upheaval is inevitable. Trump appears willing to test the bounds of convention and his own powers against a legal and political establishment that he believes is conspiring against him. The higher the pressure, the more defiant the President becomes -- even if it puts him at odds with his legal team.The higher the pressure, the more defiant the President becomesTrump continues to call the Russia probe a 'witch hunt' 
 Question:But the sense of chaos around the _ is deepening.

White House