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: (CNN) General Michael Hayden told CNN's Fareed Zakaria that his opinion about the usefulness of special investigations had changed since FBI Director James Comey was fired. Comey was in the middle of investigating possible ties between Trump's presidential campaign and Russia's interference in the 2016 election when he was dismissed last Tuesday on the recommendation of Deputy Attorney General Rod Rosenstein and Attorney General Jeff Sessions. The many paths from Trump to RussiaHayden, a four-star general and former NSA and CIA chief, told Zakaria that up until Comey's firing he had been cynical of special investigations as a whole, confessing to a real "dislike" of "special structures, special prosecutors and efforts and so on.General Hayden says he had always been cynical of special investigations but changed his mind after Comey's firingHayden suggests an "extraordinary structure" is needed so Americans can "understand what happened here" 
 Question:But now, Hayden insisted, with the future of the _ investigation unknown, he's not so sure.

Russia