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) The law firm for the Hillary Clinton campaign and the Democratic National Committee has acknowledged its clients' role in paying for opposition research on Donald Trump that helped fund the now-infamous dossier of allegations about the now-President and Russia. A source familiar with the matter told CNN on Tuesday that the law firm Perkins Coie, as part of its representation of the Clinton campaign and the DNC, retained the intelligence firm Fusion GPS and entered "into an engagement for research services that began in April 2016 and concluded before the election in early November." A letter to Fusion GPS, which was written by Perkins Coie general counsel Matthew Gehringer, notes that it is revealing its role in hiring Fusion to aid the firm in its fight not to be forced to reveal its confidential list of clients.Trump continues to raise questions about the dossier's backersFusion GPS's bank records were subpoenaed 
 Question:_ also claimed that Nunes should have notified it about the subpoena of its bank records.
Output:
Fusion GPS