The chairman of the House oversight committee asked the FBI on Thursday to turn over more documents about former FBI Director James Comey's interactions with the White House and Justice Department, including materials dating back almost four years to the Obama administration.
Mueller was appointed May 17 to oversee the investigation into Russia's alleged meddling in the 2016 USA presidential election.
The FBI blamed the hiring of special counsel Robert Mueller to investigate the matter for its refusal.
"In this case, the focus of the Committee's investigation is the independence of the FBI, including conversations between the President and Comey and the process by which Comey was removed from his role as director", he continued.
The statement from attorney Jamie Gorelick was issued Thursday amid reports that the FBI was investigating meetings Kushner had in December with Russian officials.
Kushner, a key White House adviser, had meetings late a year ago with Russia's ambassador to the U.S., Sergey Kislyak, and Russian banker Sergey Gorkov.More news: Trump 'wide open' on whether to support Paris climate accord
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Chaffetz included another request for materials related to Comey and communications with the White House and Attorney General Jeff Sessions, with a deadline of June 8.
The FBI responded to Chaffetz in a letter Thursday citing Robert Mueller's appointment as special counsel in the bureau's investigation of Russian Federation as justification to delay fulfilling the committee's request.
Many congressional committees have sought out Comey's testimony after news broke last week that he had written a memo stating that Trump had asked him to drop his investigation into former national security adviser Michael Flynn. But the bureau told him Thursday it could not yet turn them over because of Mueller's probe.
The FBI, several congressional committees, and a special counsel appointed by the Justice Department are all looking into allegations of Russian meddling in the 2016 U.S. election and possible ties between Trump associates and Russia.
He says the constitution gives his committee the right to investigate matters of high public interest. Gowdy led a special House panel that spent more than two years investigating the deadly 2012 attacks at a US diplomatic compound in Benghazi, Libya.