WASHINGTON, July 19 (Reuters) - President Donald Trump's son Donald Trump Jr., son-in-law Jared Kushner and former campaign manager Paul Manafort were asked to appear before U.S. Senate committees next week to answer questions about the campaign's alleged connections to Russia, officials said on Wednesday.
The appearances of such close associates of the president represent a significant development in the months-long effort to probe Russian meddling in the 2016 U.S. presidential election and possible collusion with the Trump campaign.
Trump, who came into office in January, has been dogged by allegations that his associates were connected to Russia, which U.S. intelligence agencies have accused of interfering in last year's election. Trump has denied any collusion.
Trump's former campaign manager Paul Manafort through the years
Trump's former campaign manager Paul Manafort through the years
U.S. Republican presidential candidate Donald Trump's campaign chair and convention manager Paul Manafort speaks at a press conference at the Republican Convention in Cleveland, U.S., July 19, 2016. REUTERS/Carlo Allegri
Republican presidential nominee Donald Trump gives a thumbs up as his campaign manager Paul Manafort (C) and daughter Ivanka (R) look on during Trump's walk through at the Republican National Convention in Cleveland, U.S., July 21, 2016. REUTERS/Rick Wilking
U.S. Republican presidential candidate Donald Trump's campaign chair and convention manager Paul Manafort appears at a press conference at the Republican Convention in Cleveland, U.S., July 19, 2016. REUTERS/Carlo Allegri
Republican U.S. presidential candidate Donald Trump's campaign manager Paul Manafort talks to the media from the Trump family box on the floor of the Republican National Convention in Cleveland, Ohio, U.S. July 18, 2016. REUTERS/Jonathan Ernst
Paul Manafort, senior advisor to Republican U.S. presidential candidate Donald Trump, smiles as he talks with other Trump campaign staff after Trump spoke to supporters following the results of the Indiana state primary, at Trump Tower in Manhattan, New York, U.S., May 3, 2016. REUTERS/Lucas Jackson
U.S. presidential candidate Donald Trump's senior campaign adviser Paul Manafort (L) walks into a reception with former Republican presidential candidate Dr. Ben Carson, at the Republican National Committee Spring Meeting at the Diplomat Resort in Hollywood, Florida, April 21, 2016. REUTERS/Joe Skipper
CLEVELAND, OH - JULY 21: Trump campaign manager Paul Manafort listens to Ivanka Trump speak at the Republican National Convention in Cleveland on July 21, 2016. (Photo by Michael Robinson Chavez/The Washington Post via Getty Images)
UNITED STATES - JULY 20: A man with a security credential takes a selfie at the podium as Donald Trump, flanked by campaign manager Paul Manafort and daughter Ivanka, checks the podium early Thursday afternoon in preparation for accepting the GOP nomination to be President at the 2016 Republican National Convention in Cleveland, Ohio on Wednesday July 20, 2016. (Photo By Bill Clark/CQ Roll Call)
UNITED STATES - JULY 19: Paul Manafort, advisor to Donald Trump, is seen on the floor of the Quicken Loans Arena at the Republican National Convention in Cleveland, Ohio, July 19, 2016. (Photo By Tom Williams/CQ Roll Call)
MEET THE PRESS -- Pictured: (l-r) Paul Manafort., Convention Manager, Trump Campaign, appears on 'Meet the Press' in Washington, D.C., Sunday April 10, 2016. (Photo by: William B. Plowman/NBC/NBC NewsWire via Getty Images)
NA.R.DoleMicCk1.081596.RG.Republican presidential candidate Bob Dole looks up from podium at balloons and television cameras as convention center manager Paul Manafort, at right, points out preparations for tonight's acceptance speech in San Diego, 08/15/96. (Photo by Robert Gauthier/Los Angeles Times via Getty Images)
WASHINGTON, DC - MARCH 21: Paul Manafort, Roger Stone and Lee Atwater, young Republicans political operatives who have set up lobbying firms. (Photo by Harry Naltchayan/The Washington Post via Getty Images)
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The U.S. Senate Judiciary Committee said on Wednesday that it had called Trump's eldest son, Donald Trump Jr., and Manafort to testify on July 26 at a hearing.
The president's son released emails earlier this month that showed him eagerly agreeing to meet last year with a woman he was told was a Russian government lawyer who might have damaging information about Democratic presidential candidate Hillary Clinton.
The meeting was also attended by Manafort and Kushner, who is now a senior adviser at the White House.
Kushner is scheduled to be interviewed by the Senate Intelligence Committee on Monday, July 24, behind closed doors.
"Working with and being responsive to the schedules of the committees, we have arranged Mr. Kushner's interview with the Senate for July 24," Kushner's attorney, Abbe Lowell, said in a statement. "He will continue to cooperate and appreciates the opportunity to assist in putting this matter to rest."
Jared Kushner through the years
Jared Kushner through the years
UNITED STATES - AUGUST 08: Jared Kushner attends the New York premiere of 'Factotum' at the IFC Center Theater. (Photo by Richard Corkery/NY Daily News Archive via Getty Images)
NEW YORK CITY, NY - JUNE 16: Laura Englander and Jared Kushner attend The Partnership for Public Service's Third Annual Black Tie Gala Honoring John McCain with 'The Theodore Roosevelt Award for the Advancement of Public Service' at Waldorf-Astoria on June 16, 2005 in New York City. (Photo by Jimi Celeste/Patrick McMullan via Getty Images)
Jared Kushner during Miss Potter New York Premiere - Inside Arrivals at DGA Theater in New York City, New York, United States. (Photo by Lawrence Lucier/FilmMagic)
NEW YORK CITY, NY - MAY 8: Mort Zuckerman and Jared Kushner attend TIME Magazine's 100 Most Influential People 2007 at Jazz at Lincoln Center on May 8, 2007 in New York City. (Photo by PATRICK MCMULLAN/Patrick McMullan via Getty Images)
NEW YORK CITY, NY - JUNE 14: (L-R) Jerry Della Famina, Matthew Weiner and Jared Kushner attend AMC Hosts a Special Preview and Discussion of Their Provocative New Series 'MAD MEN' at Michael's on June 14, 2007 in New York City. (Photo by JIMI CELESTE/Patrick McMullan via Getty Images)
Michael Moore and Jared Kushner during 'Sicko' New York City Premiere - Reception at Ziegfeld Theater in New York City, New York, United States. (Photo by Jamie McCarthy/WireImage for The Weinstein Company)
NEW YORK - SEPTEMBER 24: Owner of the New York Observer Jared Kushner arrives at The Metropolitan Opera's Opening Night at Lincoln Center September 24, 2007 in New York City. (Photo by Amy Sussman/Getty Images for Metropolitan Opera)
NEW YORK CITY, NY - SEPTEMBER 9: (L-R) Ivanka Trump, Narciso Rodriguez and Jared Kushner attend Afterparty for the NARCISO RODRIGUEZ Spring/Summer 2008 Collection at Gramercy Park Hotel on September 9, 2007 in New York City. (Photo by JOE SCHILDHORN/Patrick McMullan via Getty Images)
NEW YORK CITY, NY - MARCH 13: vanka Trump (in Elie Saab and Ivanka Trump Fine Jewelry) and Jared Kushner attend The Young Fellows of The Frick Collection, with ELIE SAAB and IVANKA TRUMP Fine Jewelry present a gala 'Un Ballo in Maschera' at The Frick Collection on March 13, 2008 in New York City. (Photo by DAVID X PRUTTING/Patrick McMullan via Getty Images)
BEDMINSTER, NJ - OCTOBER, 25: In this handout image provided by Ivanka Trump and Jared Kushner, Ivanka Trump (R) and Jared Kushner (L) attend their wedding at Trump National Golf Club on October 25, 2009 in Bedminster, New Jersey. (Photo Brian Marcus/Fred Marcus Photography via Getty Images)
ï¿½2010 RAMEY PHOTO August 19, 2010 - Porto Cervo - Sardinia Ivanka Trump,the daughter of Ivana and Donald Trump, is spending a few days on holiday with her husband Jared Kushner. CPE/MB (Photo by Philip Ramey/Corbis via Getty Images)
Jared Kushner, Owner of New York Observer and Kai Madison Trump attend the 4th annual Eric Trump Foundation Golf Invitational at the Trump National Golf Club Westchester on September 14, 2010 in Briarcliff Manor, New York.
NEW YORK - NOVEMBER 18: Jared Kushner speaks at the FINCA 25th Anniversary Creating Pathways Out of Poverty event at Capitale Bowery on November 18, 2010 in New York City. (Photo by Joe Corrigan/Getty Images for FINCA)
NEW YORK, NY - MARCH 09: Jared Kushner, Ivanka Trump and Donald Trump attend the COMEDY CENTRAL Roast of Donald Trump at the Hammerstein Ballroom on March 9, 2011 in New York City. (Photo by Jeff Kravitz/FilmMagic)
NEW YORK, NY - APRIL 17: Jared Kushner and Ivanka Trump attend the Vanity Fair Party during the 2012 Tribeca Film Festival at the State Supreme Courthouse on April 17, 2012 in New York City. (Photo by Jim Spellman/WireImage)
DORAL, FL - MARCH 07: Jared Kushner, Ivanka Trump and Eric Trump attend the Carolina Herrera Fashion Show with GREY GOOSE Vodka at the Cadillac Championship at Trump National Doral on March 7, 2014 in Doral, Florida. (Photo by John Parra/Getty Images for GREY GOOSE)
BRIARCLIFF MANOR, NY - SEPTEMBER 15: Lara Yunaska and Jared Kushner attend The Eric Trump 8th Annual Golf Tournament at Trump National Golf Club Westchester on September 15, 2014 in Briarcliff Manor, New York. (Photo by Dave Kotinsky/Getty Images)
NEW YORK, NY - MAY 04: Jared Kushner and Ivanka Trump attend the 'China: Through The Looking Glass' Costume Institute Benefit Gala at the Metropolitan Museum of Art on May 4, 2015 in New York City. (Photo by Axelle/Bauer-Griffin/FilmMagic)
NEW YORK, NY - MARCH 26: Ivanka Trump and Jared Kushner are seen on March 26, 2016 in New York City. (Photo by Tal Rubin/GC Images)
NEW YORK, NY - SEPTEMBER 11: Ivanka Trump and husband Jared Kushner attend the men's final between Novack Djokovic of Serbia and Stan Wawrinka of Switzerland at Arthur Ashe Stadium on day 14 of the 2016 US Open at USTA Billie Jean King National Tennis Center on September 11, 2016 in the Queens borough of New York City. (Photo by Jean Catuffe/GC Images)
Ivanka Trump (L) and husband Jared Kushner are seen at a polling station in a school during the 2016 presidential elections on November 8, 2016 in New York. / AFP / MANDEL NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)
(FromL) Ivanka Trump, her husband Jared Kushner and Tiffany Trump smile as Republican presidential elect Donald Trump speaks during election night at the New York Hilton Midtown in New York on November 9, 2016.
Trump stunned America and the world Wednesday, riding a wave of populist resentment to defeat Hillary Clinton in the race to become the 45th president of the United States. / AFP / MANDEL NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)
NEW YORK, NY - NOVEMBER 18: Jared Kushner, the son-in-law of President-elect Donald Trump, walks through the lobby of Trump Tower with his wife Ivanka on November 18, 2016 in New York City. President-elect Trump and his transition team are in the process of filling cabinet and other high level positions for the new administration. (Photo by Spencer Platt/Getty Images)
NEW YORK, NY - DECEMBER 7: Jared Kushner sits in Vice President-elect Mike Pence's car outside of Trump Tower, December 7, 2016 in New York City. President-elect Donald Trump and his transition team are in the process of filling cabinet and other high level positions for the new administration. (Photo by Drew Angerer/Getty Images)
White House senior advisor Jared Kushner (2nd L) smiles at his wife Ivanka Trump as she is mentioned by Israel's Prime Minister Benjamin Netanyahu during his remarks at the Yad Vashem holocaust memorial in Jerusalem May 23, 2017. REUTERS/Jonathan Ernst
White House senior advisor Jared Kushner arrives to join U.S. President Donald Trump and the rest of the U.S. delegation to meet with Saudi Arabia's King Salman bin Abdulaziz Al Saud at the Royal Court in Riyadh, Saudi Arabia May 20, 2017. REUTERS/Jonathan Ernst
Ivanka Trump, daughter of US President Donald Trump, her husband Jared Kushner, senior adviser to Trump step off Air Force One upon arrival at Rome's Fiumicino Airport on May 23, 2017. Donald Trump arrived in Rome for a high-profile meeting with Pope Francis in what was his first official trip to Europe since becoming US President. / AFP PHOTO / MANDEL NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)
Jared Kushner is seen at the Royal Court after US President Donald Trump received the Order of Abdulaziz al-Saud medal in Riyadh on May 20, 2017. / AFP PHOTO / MANDEL NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)
BAGHDAD, IRAQ - APRIL 03: In this handout provided by the Department of Defense (DoD), Jared Kushner, Senior Advisor to President Donald J. Trump, speaks with Lt. Gen. Stephen J. Townsend, commander, Combined Joint Task Force -- Operation Inherent Resolve, during a helo ride aboard a CH-47 over Baghdad, Iraq, April 3, 2017. (Photo by Dominique A. Pineiro/DoD via Getty Images)
QAYYARAH WEST, IRAQ - APRIL 04: In this handout provided by the Department of Defense (DoD), Jared Kushner, Senior Advisor to President Donald J. Trump meets with Service Members at a forward operating base near Qayyarah West in Iraq, April 4, 2017. (Photo by Dominique A. Pineiro/DoD via Getty Images)
WASHINGTON, DC - MARCH 17: U.S. President Donald Trump (C) walks along the West Wing colonnade with his daughter Ivanka Trump (L) and his son-in-law and Senior Advisor to the President for Strategic Planning Jared Kushner before he departs the White House March 17, 2017 in Washington, DC. The first family is scheduled to spend the weekend at their Mar-a-Lago Club in Palm Beach, Florida. (Photo by Chip Somodevilla/Getty Images)
Senior Advisor to the President, Jared Kushner (L), walks with his wife Ivanka Trump to board Marine One at the White House in Washington, DC, on March 3, 2017.
The two are travelling with US President Donald Trump to Florida. / AFP PHOTO / MANDEL NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)
U.S. President Donald Trump, center, speaks while Jared Kushner, senior White House advisor, left, and Kenneth Frazier, chairman and chief executive officer of Merck & Co., listen during a meeting with manufacturing executives in the State Dining Room of the White House in Washington, D.C., U.S., on Thursday, Feb. 23, 2017. Trump told some of America's most prominent corporate executives that he intends to put them to work restoring manufacturing jobs and U.S. dominance in trade. Photographer: Olivier Douliery/Bloomberg via Getty Images
WASHINGTON, DC - JANUARY 30: Jared Kushner, senior adviser to President Donald Trump, listens during a meeting with small business leaders in the Roosevelt room at the White House in Washington, DC on Monday, Jan. 30, 2017. (Photo by Jabin Botsford/The Washington Post via Getty Images)
Ivanka Trump and her husband Jared Kushner dance at the Liberty Ball at the Washington DC Convention Center following Donald Trump's inauguration as the 45th President of the United States, in Washington, DC, on January 20, 2017. / AFP / JIM WATSON (Photo credit should read JIM WATSON/AFP/Getty Images)
WASHINGTON, DC - MAY 09: Ianka Trump (R), Jared Kushner, White House senior advisor to the president for strategic planning and son-in-law to President Donald Trump, and two of their children greet members of the armed forces and their families during an event celebrating National Military Appreciation Month and National Military Spouse Appreciation Day in the Eisenhower Executive Office Building May 9, 2017 in Washington, DC. Vice President Mike Pence hosted about 160 spouses and children of the active duty U.S. military members. (Photo by Chip Somodevilla/Getty Images)
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The Judiciary Committee announced Trump Jr. and Manafort's appearance in a statement on its website.
Senator Sheldon Whitehouse, a Democratic member of the Judiciary Committee, said that committee's hearing would enable the panel to begin to get testimony under oath.
"There has been an enormous amount that has been said publicly but it's not under oath, which means that people are free to omit matters or lie with relative impunity," Whitehouse told CNN.
The Senate Intelligence Committee is conducting one of the main investigations of Russia's meddling in the 2016 U.S. election and possible collusion by Trump associates, but the Judiciary committee has been looking into related issues.
The public Judiciary hearing on Wednesday will look into rules governing the registration of agents working for foreign governments in the United States and foreign attempts to influence U.S. elections.
Chuck Grassley, the committee's Republican chairman, has said he wanted to question the Trump associates, but has also raised concerns about why the Obama administration allowed Natalia Veselnitskaya, the Russian lawyer who attended the Trump Tower meeting in June, into the United States.
He also has called before the committee and threatened to subpoena Glenn Simpson, a co-founder of Fusion GPS, a firm that commissioned former British intelligence agent Christopher Steele to dig up opposition research on Trump, when he was a presidential candidate. (Reporting by Patricia Zengerle and Jeff Mason; Additional reporting by Eric Beech, David Alexander and Julia Ainsley; Editing by Toni Reinhold)