WASHINGTON, July 8 — In a sharply worded letter to President Bush in May, an important Congressional ally charged that the administration might have violated the law by failing to inform Congress of some secret intelligence programs and risked losing Republican support on national security matters.

The letter from Representative Peter Hoekstra of Michigan, the Republican chairman of the House Intelligence Committee, did not specify the intelligence activities that he believed had been hidden from Congress.

But Mr. Hoekstra, who was briefed on and supported the National Security Agency's domestic surveillance program and the Treasury Department's tracking of international banking transactions, clearly was referring to programs that have not been publicly revealed.

Recently, after the harsh criticism from Mr. Hoekstra, intelligence officials have appeared at two closed committee briefings to answer questions from the chairman and other members. The briefings appear to have eased but not erased the concerns of Mr. Hoekstra and other lawmakers about whether the administration is sharing information on all of its intelligence operations.

A copy of the four-page letter dated May 18, which has not been previously disclosed, was obtained by The New York Times.

I have learned of some alleged intelligence community activities about which our committee has not been briefed, Mr. Hoesktra wrote. If these allegations are true, they may represent a breach of responsibility by the administration, a violation of the law, and, just as importantly, a direct affront to me and the members of this committee who have so ardently supported efforts to collect information on our enemies.

He added: The U.S. Congress simply should not have to play Twenty Questions to get the information that it deserves under our Constitution.

Frederick Jones, a White House spokesman, declined to comment on the concerns raised by Mr. Hoekstra but said that we will continue to work closely with the chairman and other Congressional leaders on important national security issues.

A spokesman for Mr. Hoekstra, Jamal D. Ware, said he could not discuss the activities allegedly withheld from Congress. But he said that Mr. Hoekstra remained adamant that no intelligence programs could be hidden from oversight committees.

Chairman Hoekstra has raised these issues with the administration to ensure that the Intelligence Committee is able to conduct its job of oversight, Mr. Ware said. Intelligence officials have committed to being forthcoming with Congress, and Chairman Hoekstra is going to hold them to their word.

Mr. Hoekstra's blunt letter is evidence of a rift between the White House and House Republican leaders over the administration's perceived indifference to Congressional oversight and input on intelligence matters. Mr. Hoekstra wrote that he had shared his complaints with House Speaker J. Dennis Hastert, Republican of Illinois, and that the speaker concurs with my concerns.

A spokesman for Mr. Hastert declined to comment.

The letter appears to have resulted at least in part from the White House's decision, made early in May, to name Gen. Michael V. Hayden to lead the Central Intelligence Agency, with Stephen R. Kappes as his deputy. The letter was sent the day of General Hayden's confirmation hearing before the Senate Intelligence Committee.

Mr. Hoekstra (pronounced HOOK-stra) complained publicly about the choices when they were announced, but his private letter to Mr. Bush was much harsher. He warned that the choice of Mr. Kappes, who he said was part of a group at the C.I.A. that intentionally undermined the administration, sends a clear signal that the days of collaborative reform between the White House and this committee may be over.

Mr. Hoekstra also expressed concern about the intelligence reorganization under John D. Negroponte, the first director of national intelligence, who he said was creating a large, bureaucratic and hierarchical structure that will be less flexible and agile than our adversaries.

Mr. Hoekstra's views on oversight appear to be shared by some other Intelligence Committee members.

I think the executive branch has been insufficiently forthcoming on a number of important programs, Representative Heather A. Wilson, Republican of New Mexico, said in an interview. She would not discuss any programs on which the committee had not been briefed, but she said that in the Bush administration, there's a presumption that if they don't tell anybody, a problem may get better or it will solve itself.

Ms. Wilson said she shared deep concerns about the pace and direction of intelligence reforms overseen by Mr. Negroponte's office. We have some troubled programs, she said.

American intelligence agencies routinely conduct many secret programs, but under the National Security Act, the agencies are required to keep the Congressional intelligence committees fully and currently informed of all intelligence activities. Even in the case of especially sensitive covert actions, the law requires briefings for at least the leaders from both parties of the committees and the House and Senate.

As the administration has asserted broad presidential authority to fight terrorism, concerns about Congressional oversight and checks and balances between the branches of government have become increasingly heated. Democrats complained that the administration's failure to brief the full Intelligence Committees on the N.S.A. warrantless eavesdropping, which focuses on the international communications of Americans and others inside the United States, was a violation of the National Security law. Some members of Congress said they had been briefed on the Treasury Department's bank monitoring program, which examines international money transfers through a Brussels-based consortium, only after The New York Times began making inquiries in recent months.

But the assertion that other intelligence activities had been hidden from Congress is particularly surprising coming from Mr. Hoekstra, who defended the administration's limited briefings on the N.S.A. program against Democratic criticism.

An official familiar with recent exchanges between the intelligence agencies and the House committee said Friday that General Hayden had twice briefed the full committee and had addressed Mr. Hoekstra's questions about the intelligence activities referred to in the letter. The C.I.A. director promised a free flow of information, and Mr. Hoekstra, who initially objected to placing a military officer in charge of the C.I.A., said he would work closely with the agency's new leadership.

The official, who spoke of the briefings only when granted anonymity because they were classified, declined to say anything about what the activities were or which agencies they involved.

Officials with both Mr. Negroponte's office and the C.I.A. declined to comment specifically on Mr. Hoekstra's letter. But Carl Kropf, a spokesman for Mr. Negroponte, said that over the past year his office had engaged in hundreds of briefings, meetings and discussions with Congressional committees.

He added, We value this dialogue with Congress, and we will continue to provide the committee with the information they need to fulfill their responsibilities.

Jennifer Millerwise Dyck, a spokeswoman for General Hayden, said that the director believes in the important oversight role Congress plays, and he will continue regular and transparent interactions with members.

Since his appointment as committee chairman in August 2004, Mr. Hoekstra has been a critical ally of the White House on intelligence matters. He has supported the administration's most controversial policies, including its treatment of terrorist suspects, and he has balked at Democratic demands for an investigation of pre-war intelligence on Iraq. He has defended the legality and necessity of the N.S.A. program and the bank monitoring.

Mr. Hoekstra has been one of the strongest advocates in Congress for a crackdown on leaks of classified information to the media, a cause championed by both Mr. Bush and Vice President Dick Cheney.

But in recent months, Mr. Hoekstra has begun to express some disaffection. In March, he joined the top Democrat on the Intelligence Committee, Representative Jane Harman of California, in a public critique of Mr. Negroponte's performance. He criticized intelligence officials for initially resisting his demand that thousands of captured Iraqi documents be posted on the Web. Like other House Republicans, he bristled when Porter J. Goss, a former House colleague, was forced out as C.I.A. director in early May.

Most recently, Mr. Hoekstra strongly criticized a news briefing arranged by Mr. Negroponte's office on an Army report that 500 pre-Gulf War chemical shells had been found scattered around Iraq. On June 29, Mr. Hoekstra, who had said the finding established that there were weapons of mass destruction in Iraq, made public an angry letter to Mr. Negroponte calling the briefing inaccurate, incomplete and occasionally misleading and asserting that attempts were made to downplay the significance of relevant facts.

A spokesman for Mr. Negroponte's office said he had not yet replied to the complaint.

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