The head of the National Security Agency on Thursday told Senate lawmakers that preventing his agency from collecting Americans’ information in bulk would make it harder to do its job.Under questioning before the Senate Intelligence Committee, Adm. Michael Rogers agreed that ending bulk collection would “significantly reduce [his] operational capabilities.”ADVERTISEMENT“Right now, bulk collection gives us the ability ... to generate insights as to what’s going on,” Rogers told the committee.The NSA head also referenced a January report from the National Academy of Sciences that concluded there is “no software technique that will fully substitute for bulk collection” because of the ability to search through the storehouse of old information. “That independent, impartial, scientifically-founded body came back and said no, under the current structure there is no real replacement,” Rogers said.Rogers was questioned on Thursday by Sen. Ron Wyden (D-Ore.), a member of the Intelligence Committee who has become its most vocal privacy hawk.