It’s been a year since Sen. Chuck Grassley Charles (Chuck) Ernest GrassleySenate Republicans face tough decision on replacing Ginsburg What Senate Republicans have said about election-year Supreme Court vacancies Biden says Ginsburg successor should be picked by candidate who wins on Nov. 3 MORE (R-Iowa) asked Attorney General Eric Holder Eric Himpton HolderThe Hill's Campaign Report: Trump's rally risk | Biden ramps up legal team | Biden hits Trump over climate policy Biden campaign forming 'special litigation' team ahead of possible voting battle Pompeo, Engel poised for battle in contempt proceedings MORE how it handled National Security Agency officials who abused the agency's powers, and he still hasn’t gotten an answer.

Now, the head of the Senate Judiciary Committee is renewing his call for Holder to explain whether or not any of the dozen people who used spying tools to track their spouses or others without authorization have been punished.

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“Of course, the overwhelming majority of those who work in our national security and intelligence communities are dedicated, law-abiding people who deserve our profound thanks for helping to keep us safe,” Grassley wrote in a letter to Holder on Monday. “Nonetheless, there must be appropriate accountability for those few who violate the trust placed in them.

“Unfortunately, the American people still do not know whether anyone has been held accountable by the Department of Justice for abusing surveillance laws designed to acquire foreign intelligence information and protect the United States against terrorist attacks.”

In 2013, shortly after Edward Snowden released his trove of documents about the NSA, the Justice Department’s inspector general revealed that there had been twelve documented instances of “intentional misuse” of the NSA’s communications collection powers by agency employees since 2003.

In one case, an employee spied on a phone number she found in her husband’s cellphone because she suspected he was cheating on her. In another, an NSA employee tracked nine different phone numbers belonging to foreign women — including at least one whom he had been sleeping with — and listened to their conversations.

At least six of those instances had been referred to the Justice Department for possible prosecution. But Holder has never responded to an October, 2013, letter from Grassley asking what happened after that.

In a hearing one year ago, Holder told Grassley that the department would respond “soon,” but that response never came.

“I believe it is appropriate that you respond to my original request without delay,” Grassley wrote on Monday.

Holder is set to leave the administration soon, assuming his successor is confirmed by the Senate. Confirmation hearings for Loretta Lynch, the attorney nominated by President Obama to replace Holder, were held last week.