A political feud erupted on Wednesday over the U.S. House Intelligence Committee’s probe of suspected Russian meddling in the 2016 presidential election, with charges that the panel’s Republican chairman subpoenaed the CIA, FBI and National Security Agency without telling Democratic members.

Committee aides complained that the chairman, Representative Devin Nunes, who publicly recused himself from leading the Russia probe in April following a secret visit he paid to White House officials, failed to consult Democrats on the subpoenas.

The subpoenas asked the spy agencies to provide details of any requests made by two top Obama administration aides and the former CIA director to “unmask” names of Trump campaign advisers inadvertently picked up in top-secret foreign communications intercepts, congressional sources said.

The former officials named in the subpoenas were Obama national security adviser Susan Rice, former U.S. Ambassador to the United Nations Samantha Power and former CIA Director John Brennan.

“Subpoenas related to the ‘unmasking’ issue would have been sent by Chairman Nunes acting separately from the committee’s Russia investigation. This action would have been taken without the minority’s (Democrats’) agreement,” said a senior committee aide, speaking on condition of anonymity. “Any prior requests for information would have been undertaken without the minority’s knowledge.”

Another congressional source, who also requested anonymity, insisted that Democrats were “informed and consulted” before the subpoenas were issued.

The CIA declined to comment on the subpoenas and the Federal Bureau of Investigation and NSA did not immediate respond to requests for comment.

U.S. privacy laws and intelligence regulations require that Americans’ names picked up in foreign communications intercepts be concealed unless senior officials request them to be disclosed for intelligence or law enforcement purposes. Any such requests undergo rigorous legal reviews.

Several U.S. officials, speaking on condition of anonymity, told Reuters that all such requests by Obama administration officials were properly scrutinized and appropriate.