Devin Nunes reviewed sensitive file on White House grounds

WASHINGTON, March 27 (Reuters) - A mystery rooted in President Donald Trump's claim that he was wiretapped by then President Barack Obama during the 2016 election campaign deepened on Monday with the disclosure that a top congressional Republican reviewed classified information about the charge on the White House grounds.

In a separate development, Trump's son-in-law, Jared Kushner, a top White House adviser, has volunteered to testify before the U.S. Senate Intelligence Committee's investigation into whether Russia attempted to interfere in the Nov. 8 U.S. election, a White House spokesman said.

SEE ALSO: Poll: Trump's approval rating drops after his 'worst week' as president

Rebecca Glover Watkins, a spokeswoman for Intelligence Committee Chairman Richard Burr, said that Kushner has been called to testify. The timing for his testimony was unclear.

U.S. Representative Devin Nunes, chairman of the House of Representatives Intelligence Committee, visited the White House the night before announcing on Wednesday that he had information that indicated some Trump associates may have been subjected to some level of intelligence activity before Trump took office on Jan. 20.

Nunes spokesman Jack Langer said in a statement that Nunes "met with his source at the White House grounds in order to have proximity to a secure location where he could view the information provided by the source."

It was the latest twist in a saga that began on March 4 when Trump said on Twitter without providing evidence that he "just found out that Obama had my 'wires tapped' in Trump Tower just before the victory."

FBI Director James Comey told Congress last Monday he had seen no evidence to support the claim.

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James Comey through the years
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James Comey through the years
FBI Director James Comey waits before testifying at a House Intelligence Committee hearing into alleged Russian meddling in the 2016 U.S. election, on Capitol Hill in Washington, U.S., March 20, 2017. REUTERS/Joshua Roberts
UNITED STATES - JUNE 14: Deputy Attorney General James B. Comey speaks at a conference at the Bloomberg News Bureau in Washington DC June 14, 2004. (Photo by Ken Cedeno/Bloomberg via Getty Images)
U.S. President Barack Obama announces James Comey (L), a Republican who served in the Bush Justice Department, as his choice to replace Robert Mueller as the next FBI director, in the Rose Garden of the White House in Washington, June 21, 2013. REUTERS/Jason Reed (UNITED STATES - Tags: POLITICS CRIME LAW)
WASHINGTON, UNITED STATES: US Deputy Attorney General James Comey (L) and FBI Assistant Director for Counterterrorism Gary Bald take questions 05 August, 2004, at the Justice Department in Washington, DC, after announcing that two men from Albany, New York, were arrested charging each with concealing material support for terrorism and participating in a money laundering conspiracy. Mosque Imam Yassin Aref, 34, and mosque founder Mohammed Hoosain, 49, were arrested following a raid on an Albany mosque late 04 August. Officials said the two men had agreed to launder money to help a presumed terrorist, actually an undercover FBI agent, buy a shoulder-fired missile. AFP PHOTO / TIM SLOAN (Photo credit should read TIM SLOAN/AFP/Getty Images)
WASHINGTON, DC - JUNE 21: James Comey (L) FBI Director nominee walks with outgoing FBI Director Robert Mueller (R) to a ceremony annoucing Comey's nomination in the Rose Garden at the White House June 21, 2013 in Washington, DC. Comey, a former Justice Department official under President George W. Bush, would replace Mueller. (Photo by Win McNamee/Getty Images)
James Comey, U.S. President Barack Obama's nominee as director of the director of the Federal Bureau of Investigation (FBI), arrives to a Senate Judiciary Committee hearing in Washington, D.C., U.S., on Tuesday, July 9, 2013. Comey, the nominee to be the next FBI director, said interrogation techniques such as waterboarding used during his time in President George W. Bush's administration constitute torture and are illegal. Photographer: Andrew Harrer/Bloomberg via Getty Images
FBI Director James Comey, right, talks to Spain's Interior Minister Jorge Fernandez Diaz, left, during a meeting in Madrid, Spain, Monday, Dec. 9, 2013. Photo: Rodrigo Garcia/NurPhoto (Photo by NurPhoto/Corbis via Getty Images)
FBI Director James B. Comey testifies in front of the Senate Judiciary Committee on Capitol Hill in Washington. (Photo by Brooks Kraft LLC/Corbis via Getty Images)
DENVER, CO - AUGUST 20: Federal Bureau of Investigation Director James Comey speaks during a press conference at the conclusion of a visit to the Denver FBI Field Office on Wednesday, August 20, 2014 in Denver, Colorado. Director Comey's visit to the Denver FBI Field Office is part of his plan to visit all FBI Field Offices in his first year as director. (Photo by Kent Nishimura/The Denver Post via Getty Images)
The shadow of FBI Director James Comey is seen as he addresses the audience during the Overseas Security Advisory Council (OSAC) annual meeting at the State Department in Washington, DC on November 19, 2014. AFP PHOTO/ MLADEN ANTONOV (Photo credit should read MLADEN ANTONOV/AFP/Getty Images)
FBI Director James Comey adjusts his tie before testifying to the Senate Select Committee on Intelligence hearing on ?Russia?s intelligence activities" on Capitol Hill in Washington, U.S., January 10, 2017. REUTERS/Joshua Roberts
FBI Director James Comey testifies before a House Oversight and Government Reform Committee on the "Oversight of the State Department" in Washington U.S. July 7, 2016. REUTERS/Gary Cameron
WASHINGTON, DC - JANUARY 13: FBI Director James Comey arrives at the U.S. Capitol for a classified briefing on Russia for all members of the House of Representatives January 13, 2017 on Capitol Hill in Washington, DC. The internal Office of the Inspector General at the Justice Department announced yesterday that it is conducting a review on the handling of FBI and DOJ's investigation into the Hillary Clinton private e-mail server case. (Photo by Alex Wong/Getty Images)
FBI Director James Comey testifies to the Senate Select Committee on Intelligence hearing on ?Russia?s intelligence activities" on Capitol Hill in Washington, U.S., January 10, 2017. REUTERS/Joshua Roberts
WASHINGTON, DC - JANUARY 10: FBI Director James Comey and Director of National Intelligence James Clapper (L-R) arrive to testify before the Senate (Select) Intelligence Committee in the Dirksen Senate Office Building on Capitol Hill January 10, 2017 in Washington, DC. The intelligence heads testified to the committee about cyber threats to the United States and fielded questions about effects of Russian government hacking on the 2016 presidential election. (Photo by Joe Raedle/Getty Images)
WASHINGTON - JULY 8: Deputy Attorney General James B. Comey (L) announces indictment of the former Enron CEO, Kenneth Lay, while FBI Director Robert Mueller listens July 8, 2004 in Washington DC. Lay was indicted on 11 counts, including securities and wire fraud and false and misleading statements surrounding the collapse of the energy giant. (Photo by Mark Wilson/Getty Images)
James Brien Comey, Jr. (born December 14, 1960) is the seventh and current Director of the Federal Bureau of Investigation, 2013. (Photo by Universal History Archive/UIG via Getty Images)
UNITED STATES - JULY 31: Manhattan U.S. Attorney James Comey announces the arrest in Italy of alleged Russian mobster Alimzhan Tokhtakhounov on charges that he engineered the ice-skating vote swap scandal that rocked the Winter Olympics in Salt Lake City. Tokhtakhounov allegedly fixed the Russian skaters' victory in figure skating in exchange for throwing the gold medal to two French ice dancers. Amid worldwide outrage, the Canadian figure skaters were eventually awarded a second gold medal. , (Photo by Todd Maisel/NY Daily News Archive via Getty Images)
WASHINGTON, DC - JUNE 21: FBI Director nominee James Comey (L) speaks as U.S. President Barack Obama (R) looks on during a ceremony announcing Comey's nomination in the Rose Garden of the White House June 21, 2013 in Washington, DC. Comey is a former Justice Department official in the administration of former U.S. President George W. Bush. (Photo by Win McNamee/Getty Images)
UNITED STATES - DECEMBER 18: Manhattan U.S. Attorney James Comey during an interview wirth the Daily News. (Photo by Robert Rosamilio/NY Daily News Archive via Getty Images)
WASHINGTON - JUNE 08: The Honorable James Comey, Deputy Attorney General, U.S. Department of Justice, is sworn in before delivering testimony during the House Judiciary Committee hearing concerning reauthorization of the PATRIOT Act June 8, 2005 on Capitol Hill in Washington, DC. The Committee has heard from 30 witnesses during its 10 hearings this year, from both supporters and those with concerns over certain aspects of this anti-terrorism law. (Photo by Joe Raedle/Getty Images)
James Comey, U.S. President Barack Obama's nominee as director of the director of the Federal Bureau of Investigation (FBI), laughs during a Senate Judiciary Committee hearing in Washington, D.C., U.S., on Tuesday, July 9, 2013. Comey, the nominee to be the next FBI director, said interrogation techniques such as waterboarding used during his time in President George W. Bush's administration constitute torture and are illegal. Photographer: Andrew Harrer/Bloomberg via Getty Images
UNITED STATES - JUNE 26: James Comey, right, President Obama's nominee as the next director of the Federal Bureau of Investigation, meets with Senate Judiciary Chairman Patrick Leahy, D-Vt., in the Russell Senate Office Building on Wednesday, June 26, 2013. (Photo By Bill Clark/CQ Roll Call)
WASHINGTON, DC - FEBRUARY 04: FBI Director James Comey testifies during a hearing before the House (Select) Intelligence Committee February 4, 2014 on Capitol Hill in Washington, DC. The committee held a hearing to examine threats to the U.S. from all around the world. (Photo by Alex Wong/Getty Images)
FBI Director James Comey (L) and US Attorney General Eric Holder announce a record 8.9 billion USD fine against the French bank BNP Paribas for violating international sanctions during a press conference at the US Justice Department in Washington on June 30, 2014. AFP PHOTO / Saul LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)
FBI Director James B. Comey testifies in front of the Senate Judiciary Committee on Capitol Hill in Washington. (Photo by Brooks Kraft LLC/Corbis via Getty Images)
FBI Director James Comey is sworn in prior to testifying before a Senate Judiciary Committee hearing on "Oversight of the Federal Bureau of Investigation" on Capitol Hill in Washington, U.S., May 3, 2017. REUTERS/Kevin Lamarque
Federal Bureau of Investigation Director James Comey speaks at the Intelligence National Security Alliance Leadership Dinner at the Hilton Mark Center in Alexandria, Virginia, U.S., March 29, 2017. REUTERS/Aaron P. Bernstein
U.S. President Barack Obama (C) sits with FBI Director James Comey in the Oval Office in Washington after making comments to the media about shootings at military facilities in Chattanooga, Tennessee, July 16, 2015. REUTERS/Yuri Gripas
BOSTON, MA - MARCH 08: FBI Director James Comey speaks at a cybersecurity conference at Boston College on March 8, 2017 in Boston, Massachusetts. Comey, delivering the keynote address to the two-day conference, did not address recent claims by President Donald Trump that former President Barack Obama ordered a a wiretap of then-candidate Trump. (Photo by Darren McCollester/Getty Images)
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Trump's mention of wiretapping drew attention away from U.S. intelligence agencies having said that Russia tried to help Trump in the election against Democrat Hillary Clinton by hacking leading Democrats and spreading disinformation.

Moscow denies any such activities. Trump has also dismissed them.

Nunes told reporters on Wednesday that he had briefed Trump "on the concerns I had about incidental collection and how it relates to President-elect Trump and his transition team and the concerns that I have."

After an uproar over the allegations and the fact that he briefed Trump first before members of his own committee, Nunes apologized on Thursday for the way he handled the information.

A congressional source said congressional investigators have questioned agencies directly to try to find out what intelligence reports and intercepts Nunes is referring to, but that as of Monday the agencies were still saying they did not know what Nunes was talking about.

The Washington Post reported on Monday that Nunes was on his way to an event late Tuesday when he left his staff and went to review classified intelligence files brought to his attention by his source, whom he has not identified.

The White House had seized on Nunes' remarks to bolster Trump's unproven assertion that Obama wiretapped his campaign headquarters in Manhattan's Trump Tower.

5 PHOTOS
President Trump accuses Obama on Twitter of wiretapping him
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President Trump accuses Obama on Twitter of wiretapping him
Terrible! Just found out that Obama had my "wires tapped" in Trump Tower just before the victory. Nothing found. This is McCarthyism!
Is it legal for a sitting President to be "wire tapping" a race for president prior to an election? Turned down by court earlier. A NEW LOW!
I'd bet a good lawyer could make a great case out of the fact that President Obama was tapping my phones in October, just prior to Election!
How low has President Obama gone to tapp my phones during the very sacred election process. This is Nixon/Watergate. Bad (or sick) guy!
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Nunes and some other Republicans have focused much of their concern over the investigation about the possibility that some Americans' names have been improperly "unmasked" and released to the public in leaks about the investigation of whether Trump's campaign colluded with Moscow.

Nunes spokesman Langer cited concerns about the exposure of citizens' names in his statement.

"The chairman is extremely concerned by the possible improper unmasking of names of U.S. citizens, and he began looking into this issue even before President Trump tweeted his assertion that Trump Tower had been wiretapped," Langer said.

Democrats, and some Republicans, have said Nunes' actions raised serious questions over whether his committee would be able to conduct an impartial investigation of Russian hacking, the U.S. election and any potential involvement by Trump associates. (Reporting by Patricia Zengerle, Mark Hosenball and Steve Holland; editing by Grant McCool)

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