Mr. Comey’s planned testimony, which the Senate committee will hear in both open- and closed-door sessions, forces Mr. Trump to decide whether to invoke executive privilege in an attempt to prevent Mr. Comey from answering questions about his conversations with the president.
Senators are likely to ask about Mr. Comey’s assertion in a memo that Mr. Trump asked him drop the investigation into Michael T. Flynn, the former national security adviser — a request that some Democrats say amounts to obstruction of justice.
Robert S. Mueller III, the special counsel appointed by the Justice Department to lead the investigation into Russian interference in the election, has the authority to investigate obstruction and any other possible crimes.
Mr. Nunes recused himself from the Russia investigation after he became the subject of a House ethics inquiry over his handling of sensitive material, most likely related to the Russia investigation. He delegated his authority as chairman to Representative Mike Conaway, Republican of Texas.
The decision by Mr. Nunes to unilaterally issue subpoenas on Wednesday to the F.B.I., the National Security Agency and the C.I.A. came as the House committee also issued subpoenas of two Trump associates — Mr. Flynn and Michael D. Cohen, Mr. Trump’s personal lawyer — and their businesses.
Mr. Conaway and Mr. Schiff jointly approved the Russia-related subpoenas, but it was Mr. Nunes who signed them, a duty granted to him as chairman. Under the committee’s rules, subpoenas can be authorized either by the chairman in “consultation” with the top member of the minority party, or by a vote of the full committee.
Mr. Schiff said Mr. Nunes did not consult him about his decision to issue the subpoenas related to the unmasking. .
Mr. Schiff called on Speaker Paul D. Ryan of Wisconsin, who controls chairmanships, to review Mr. Nunes’s potential interference in the Russia investigation.
“While Mr. Conaway leads the Russia investigation, Mr. Nunes remains the chairman of the intel committee and has the right and responsibility to conduct oversight of the intelligence community, especially as it relates to the potential misuse of intelligence agencies against Americans,” AshLee Strong, Mr. Ryan’s spokeswoman, said in an email Thursday.
Mr. Nunes framed his decision to issue his own subpoenas as a matter of concern about “civil liberties.”
“Seeing a lot of fake news from media elites and others who have no interest in violations of Americans’ civil liberties via unmaskings,” he said on Twitter. He declined to comment further.
On March 21 — the day after Mr. Comey made the extraordinary announcement that the F.B.I. was investigating whether Mr. Trump’s campaign colluded with Russian officials to meddle in the election — Mr. Nunes made a secret trip to the White House grounds, where he viewed “dozens” of classified reports.
The next morning, Mr. Nunes told reporters he believed Mr. Trump or those around him had been incidentally caught up in foreign surveillance, fueling Mr. Trump’s debunked claim that President Barack Obama had “wiretapped” Trump Tower.
After The New York Times reported that Mr. Nunes’s sources were themselves White House officials, Democrats called for him to recuse himself from the investigation. He refused, until the House Ethics Committee opened its own inquiry into whether Mr. Nunes had himself mishandled classified information. The Ethics Committee has yet to release any findings.
Members of both parties characterized the “unmasking” subpoenas issued on Wednesday as part of the committee’s oversight responsibilities, separate from the panel’s Russia investigation and in line with previous requests for information from the intelligence community.
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