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WASHINGTON — The House committee investigating the Jan. 6 attack on the Capitol said on Wednesday that there was enough evidence to conclude that former President Donald J. Trump and some of his allies might have conspired to commit fraud and obstruction by misleading Americans about the outcome of the 2020 election and attempting to overturn the result.
In a court filing in a civil case in California, the committee’s lawyers for the first time laid out their theory of a potential criminal case against the former president. They said they had accumulated evidence demonstrating that Mr. Trump, the conservative lawyer John Eastman and other allies could potentially be charged with criminal violations including obstructing an official proceeding of Congress and conspiracy to defraud the American people.
The filing also said the men might have broken a common law statute against fraud through Mr. Trump’s repeated lies that the election had been stolen.
The filing disclosed only limited new evidence, and the committee asked the judge in the civil case to review the relevant material behind closed doors. In asserting the potential for criminality, the committee largely relied on the extensive and detailed accounts already made public of the actions Mr. Trump and his allies took to keep him in office after his defeat.
The committee added information from its more than 550 interviews with state officials, Justice Department officials and top aides to Mr. Trump, among others. It said, for example, that Jason Miller, Mr. Trump’s senior campaign adviser, had said in a deposition to the committee that Mr. Trump had been told soon after Election Day by a campaign data expert “in pretty blunt terms” that he was going to lose, suggesting that Mr. Trump was well aware that his months of assertions about a stolen election were false.
The evidence gathered by the committee “provides, at minimum, a good-faith basis for concluding that President Trump has violated” the obstruction count, the filing, written by Douglas N. Letter, the general counsel of the House, said, adding: “The select committee also has a good-faith basis for concluding that the president and members of his campaign engaged in a criminal conspiracy to defraud the United States.”
The filing said that a “review of the materials may reveal that the president and members of his campaign engaged in common law fraud in connection with their efforts to overturn the 2020 election results.”
Representatives of Mr. Trump did not respond to requests for comment.
Charles Burnham, a lawyer for Mr. Eastman, said that his client, like all lawyers, “has a responsibility to protect client confidences, even at great personal risk and expense.”
“The select committee has responded to Dr. Eastman’s efforts to discharge this responsibility by accusing him of criminal conduct,” Mr. Burnham said in a statement. “Because this is a civil matter, Dr. Eastman will not have the benefit of the constitutional protections normally afforded to those accused by their government of criminal conduct. Nonetheless, we look forward to responding in due course.”
The panel, which is controlled by Democrats, is a legislative committee and has no authority to charge the former president — or anyone else — with a crime.
But the filing contains the clearest indication yet about the committee’s direction as it weighs making a criminal referral to the Justice Department against Mr. Trump and his allies, a step that could put pressure on Attorney General Merrick B. Garland to take up the case. The Justice Department has said little of substance about whether it might ultimately pursue a case.
The filing laid out a sweeping if by now well-established account of the plot to overturn the election, which included false claims of election fraud, plans to put forward pro-Trump “alternate” electors, pressure various federal agencies to find irregularities and ultimately push Vice President Mike Pence and Congress to exploit the Electoral Count Act to keep a losing president in power.
“As the president and his associates propagated dangerous misinformation to the public,” the filing said, Mr. Eastman “was a leader in a related effort to persuade state officials to alter their election results based on these same fraudulent claims.”
The court filing stemmed from a lawsuit filed by Mr. Eastman, who is trying to persuade a judge to block the committee’s subpoena for documents in his possession, claiming “a highly partisan” invasion of his privacy. The committee issued a subpoena to Mr. Eastman in January, citing a memo he wrote laying out how Mr. Trump could use the vice president and Congress to try to invalidate the 2020 election results.
As part of the suit, Mr. Eastman sought to shield from release documents he said were covered by attorney-client privilege. In response, the committee argued — under the legal theory known as the crime-fraud exception — that the privilege does not cover information conveyed from a client to a lawyer if it was part of furthering or concealing a crime.
Mr. Eastman then argued the committee had offered “no evidence” of the existence of a crime-fraud exception, prompting the committee’s latest filing.
“The evidence supports an inference that President Trump, plaintiff and several others entered into an agreement to defraud the United States by interfering with the election certification process, disseminating false information about election fraud, and pressuring state officials to alter state election results and federal officials to assist in that effort,” the filing states.
It also made reference to a recent ruling in a civil suit in Washington, D.C., in which Judge Amit P. Mehta of the Federal District Court found that it was “plausible to believe that the president entered into a conspiracy with the rioters on Jan. 6, 2021.”
Capitol Riot’s Aftermath: Key Developments
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Subpoenaed lawyers. The House committee investigating the Jan. 6 attack has subpoenaed a half-dozen lawyers and other allies of former President Donald J. Trump who promoted false claims about widespread fraud in the 2020 election and worked to overturn his loss.
The first trial. Guy Wesley Reffitt, who is accused of obstructing the work of Congress on Jan. 6, is the first defendant to stand trial in a case stemming from the Capitol riot. The trial, which opened on Feb. 28, will set the tone for dozens of other cases.
Mr. Eastman’s memo to Mr. Trump suggested that Mr. Pence could reject electors from certain states. Mr. Eastman also participated in a briefing for nearly 300 state legislators, during which he told the group that it was their duty to “fix this, this egregious conduct, and make sure that we’re not putting in the White House some guy that didn’t get elected,” according to the committee.
As a mob was attacking the Capitol, chanting “Hang Mike Pence,” Mr. Eastman sent a hostile message to the vice president’s top lawyer, blaming Mr. Pence for the violence.
“The ‘siege’ is because YOU and your boss did not do what was necessary to allow this to be aired in a public way so that the American people can see for themselves what happened,” he wrote to Greg Jacob, Mr. Pence’s chief counsel.
In a recent filing in his suit, Mr. Eastman said Mr. Trump had retained him “because of his election law and constitutional expertise” in the fall of 2020 for “federal litigation matters in relation to the 2020 presidential general election, including election matters related to the Electoral College.”
On Sept. 3, 2020 — two months before Mr. Trump lost the election — Mr. Eastman was invited by the pro-Trump lawyer Cleta Mitchell to join an Election Integrity Working Group to begin preparing for anticipated postelection litigation. Mr. Eastman said Mr. Trump had asked Ms. Mitchell to undertake the effort in August.
The judge in the case has already denied a request from Mr. Eastman to shield nearly 19,000 emails from the committee, saying that congressional investigators have the authority to see the messages and that the First Amendment does not protect his communications. Mr. Eastman has so far turned over about 8,000 of the emails.
Michael S. Schmidt and Maggie Haberman contributed reporting.