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) Nearly five months ago, President Donald Trump bid farewell to a grinning Barack Obama, waving as the military helicopter shuttling his predecessor into post-White House life got smaller and smaller. They haven't spoken or seen each other since. For a President who seeks extensive counsel from outside the White House -- in calls to old friends, business executives, and even despotic foreign leaders -- Trump has largely forgone advice or guidance from any of the men who have held his job previously. In the months after Trump and Obama carried out a peaceful hand off of power, the two have failed to develop any sort of working relationship, according to White House advisers and former administration officials.Trump accused Obama of wiretapping himThey haven't spoken since Inauguration Day 
 Question:Once Trump was installed in office, however, things progressively soured, culminating in Trump's March tweets accusing Obama of ordering surveillance of _.

Trump