Instructions: 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: (CNN) Donald Trump's week started with Sally Yates' damning testimony about Michael Flynn and ended with a series of wild tweets and an ever-changing story about exactly why he chose to fire FBI Director James Comey. Even by Trumpian standards, the wild swings, erratic messaging and general chaos was beyond the pale -- raising real concerns about whether Trump was losing control of the ship of state. Start with the testimony of Yates, the one-time acting attorney general, to a Senate subcommittee Monday. She made clear that on two occasions -- once on January 26 and then again on January 27 -- she sought out White House counsel Don McGahn to warn him that national security adviser Michael Flynn had been compromised by the Russians and was a blackmail risk. Trump didn't fire Flynn until 18 days later -- a seemingly inexplicable amount of time given the allegations against him.Even by Trumpian standards, the wild swings, erratic messaging and general chaos was beyond the paleThe President himself debunked the White House's explanations for why he fired ComeyTrump also sent out tweets that threatened Comey and raised the specter that he might be taping conversations 
 Question:_ has built his presidency on his unpredictability and unorthodoxy.
Output:
Donald Trump