WASHINGTON - The State Department can find no emails to or from a former Hillary Clinton aide who worked for the agency and also managed Clinton's private computer server while she served as secretary of state, the government told a Republican party group in a court filing made public Monday. The agency insisted later that some messages to and from the ex-aide were recovered and turned over in other inquiries.

The government's revelation in U.S. District Court in Washington came in answer to a lawsuit by the Republican National Committee. The committee had sued over its public records request for all work-related emails sent to or received by Clinton's former aide, Bryan Pagliano, between 2009 and 2013, the years of Clinton's tenure. The lawsuit also pressed for other State Department records from the Clinton era.

The RNC's filing said lawyers for the agency had informed them in discussions that "the State Department has represented that no responsive records exist" for any Pagliano emails. Pagliano was hired at the agency after reportedly setting up Clinton's server in 2009, but the lack of any official State Department emails raises the question whether he limited his email traffic using a private account, much like Clinton did during her four years as secretary, or whether his government emails were deleted.

A State Department official said Monday that the agency possessed emails from Pagliano from the period after Clinton's term had ended, when he continued to work as a technology contractor. Agency spokeswoman Elizabeth Trudeau then added Monday evening that some Pagliano emails dating from Clinton's tenure had been recovered from agency officials' files and turned over to other organizations, including Senate investigators.

"We have previously produced through FOIA and to Congress emails sent and received by Mr. Pagliano during Secretary Clinton's tenure," Trudeau said in a public statement. At least one email, which was sent in November 2012 to Clinton from Pagliano — but possibly from his private email address — was released as part of 30,000 Clinton emails made public by the agency over the past year.

A spokesman for the RNC said the organization stood by its description of the discussions with lawyers for the State Department. The group said in its filing that "the State Department has represented that no responsive records exist."

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Raj Shah, the RNC spokesman, added, "It's hard to believe that an IT staffer who set up Hillary Clinton's reckless email server never sent or received a single work-related email in the four years he worked at the State Department." Clinton's campaign officials declined to comment in response to questions from The Associated Press.

Trudeau said the State Department is working with Congress and several public records requesters to provide relevant material. She also said agency officials continue to search for "Mr. Pagliano's emails, which the department may have otherwise retained." Trudeau also said the department would respond further to the RNC in court.

State Department officials told Senate investigators last year they could not find a file containing Pagliano's work emails during Clinton's tenure, an assertion first reported by Politico.

Pagliano has been offered immunity by the Justice Department in its continuing investigation into Clinton's server and emails and whether the setup violated national security laws. Pagliano's lawyer, Mark MacDougall, declined to comment.

The one email sent by Pagliano that surfaced among Clinton's 30,000 emails was sent to Clinton was a November 2012 birthday greeting. He wished her "Happy Birthday Madam Secretary. To many more!"

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Pagliano's email address was censored, unlike numerous official State Department addresses that are listed in Clinton's emails — suggesting he may have sent the message from a private address.

Clinton did not reply directly to Pagliano. Instead, she sent a copy of an email to an aide with the instruction "Pls respond."