Manafort attempted to tamper with potential witnesses, according to U.S. special counsel

WASHINGTON, June 4 (Reuters) - President Donald Trump's former campaign chairman, Paul Manafort, who has been indicted by U.S. Special Counsel Robert Mueller, attempted to tamper with potential witnesses, Mueller said in a court filing on Monday.

Mueller, who is investigating possible collusion between the Trump campaign and Russia, asked the judge overseeing the case in U.S. District Court for the District of Columbia to revoke or revise an order releasing Manafort ahead of his trial.

Manafort was released to home confinement after his arraignment in October.

Mueller has indicted Manafort in federal courts in Virginia and Washington, D.C., with an array of allegations from money-laundering and failing to register as a foreign agent, to bank and tax fraud. Manafort has pleaded not guilty.

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Paul Manafort indicted in Russia probe
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Paul Manafort indicted in Russia probe
U.S. President Donald Trump's former campaign manager Paul Manafort arrives for a hearing at U.S. District Court in Washington, U.S., November 2, 2017. REUTERS/Aaron P. Bernstein
Kevin Downing (C), attorney for President Donald Trump's former campaign manager Paul Manafort, arrives for a hearing at U.S. District Court in Washington, U.S., November 6, 2017. REUTERS/Yuri Gripas
Paul Manafort, former campaign manager for U.S. President Donald Trump, departs after a bond hearing at U.S. District Court in Washington, U.S., November 6, 2017. REUTERS/Joshua Roberts
Paul Manafort, former campaign manager for U.S. President Donald Trump, departs after a bond hearing at U.S. District Court in Washington, U.S., November 6, 2017. REUTERS/Joshua Roberts
U.S. President Donald Trump's former campaign manager Paul Manafort departs U.S. District Court after a hearing in the first charges stemming from a special counsel investigation of possible Russian meddling in the 2016 presidential election in Washington, U.S., October 30, 2017. REUTERS/Jim Bourg
Former Trump 2016 campaign chairman Paul Manafort (L) leaves U.S. Federal Court after being arraigned on twelve federal charges in the investigation into alleged Russian meddling in the 2016 U.S. presidential election in Washington, U.S. October 30, 2017. REUTERS/James Lawler Duggan
Former Trump 2016 campaign chairman Paul Manafort (L) leaves U.S. Federal Court after being arraigned on twelve federal charges in the investigation into alleged Russian meddling in the 2016 U.S. presidential election in Washington, U.S. October 30, 2017. REUTERS/James Lawler Duggan
Former Trump campaign manager Paul Manafort, one focus of special counsel Robert Mueller's investigation into alleged Russian meddling in the 2016 U.S. presidential election, hides behind his car visor as he leaves his home in Alexandria, Virginia, U.S. October 30, 2017. REUTERS/Jonathan Ernst TPX IMAGES OF THE DAY
U.S. President Donald Trump's former campaign manager Paul Manafort departs U.S. District Court after a hearing in the first charges stemming from a special counsel investigation of possible Russian meddling in the 2016 presidential election in Washington, U.S., October 30, 2017. REUTERS/Jim Bourg
U.S. President Donald Trump's former campaign manager Paul Manafort arrives for a hearing at U.S. District Court in Washington, U.S., November 2, 2017. REUTERS/Aaron P. Bernstein
U.S. President Donald Trump's former campaign manager Paul Manafort uses a sun visor to block the view of photographers as departs U.S. District Court after a hearing in the first charges stemming from a special counsel investigation of possible Russian meddling in the 2016 presidential election in Washington, U.S., October 30, 2017. REUTERS/Jim Bourg
WASHINGTON, DC - NOVEMBER 2: Ex Trump campaign official Paul Manafort, center, departs U.S. District Court with his attorney Kevin Downing, left, on November, 02, 2017 in Washington, DC. (Photo by Bill O'Leary/The Washington Post via Getty Images)
Paul Manafort, former campaign manager for Donald Trump, walks out of the U.S. Courthouse after a bond hearing in Washington, D.C., U.S., on Monday, Nov. 6, 2017. Manafort, 68, an international political consultant, was accused along with his right-hand man, Rick Gates, of lying to U.S. authorities about their work in Ukraine, laundering millions of dollars, and hiding offshore accounts. Both pleaded not guilty on Oct. 30. Photographer: Andrew Harrer/Bloomberg via Getty Images
WASHINGTON, DC - NOVEMBER 02: Former Donald Trump campaign manager, Paul Manafort arrives at the E. Barrett Prettyman United States Courthouse on Thursday November 02, 2017 in Washington, DC. Manafort faces several charges. (Photo by Matt McClain/The Washington Post via Getty Images)
WASHINGTON, DC - NOVEMBER 06: Former Trump campaign manager Paul Manafort and his wife Kathleen arrive at the Prettyman Federal Courthouse for a bail hearing November 6, 2017 in Washington, DC. Manafort and his former business partner Richard Gates both pleaded not guilty Monday to a 12-charge indictment that included money laundering and conspiracy. (Photo by Mark Wilson/Getty Images)
WASHINGTON, DC - NOVEMBER 06: Kevin Downing, attorney of former Trump campaign chairman Paul Manafort, arrives at a U.S. District Court House November 6, 2017 in Washington, DC. Manafort and his associate Rick Gates are scheduled to be back in court for a bond hearing this morning after they pleaded not guilty on October 30 to charges in a 12-count indictment, ranging from money laundering to acting as unregistered agents of Ukraine's former pro-Russian government. (Photo by Alex Wong/Getty Images)
Paul Manafort, former campaign manager for Donald Trump, right, arrives to the U.S. Courthouse for a bond hearing in Washington, D.C., U.S., on Monday, Nov. 6, 2017. Manafort, 68, an international political consultant, was accused along with his right-hand man, Rick Gates, of lying to U.S. authorities about their work in Ukraine, laundering millions of dollars, and hiding offshore accounts. Both pleaded not guilty on Oct. 30. Photographer: Andrew Harrer/Bloomberg via Getty Images
UNITED STATES - NOVEMBER 6: Former Trump campaign chairman Paul Manafort leaves the E. Barrett Prettyman U.S. Courthouse after a court hearing on the terms of his bail and house arrest on Monday, Nov. 6, 2017. (Photo By Bill Clark/CQ Roll Call)
WASHINGTON, DC - NOVEMBER 02: Richard Gates arrives at the Prettyman Federal Court Building for a hearing November 2, 2017 in Washington, DC. Gates and former business partner and former Trump campaign chairman Paul Manafort both pleaded not guilty Monday to a 12-charge indictment that included money laundering and conspiracy. (Photo by Chip Somodevilla/Getty Images)
WASHINGTON, DC - OCTOBER 30: Kevin Downing, who is an attorney for Paul Manafort exits the William B. Bryant Annex United States Courthouse after Manfort was indicted on several charges on Monday October 30, 2017 in Washington, DC. (Photo by Matt McClain/The Washington Post via Getty Images)
WASHINGTON, DC - OCTOBER 30: Former Trump campaign chairman Paul Manafort gets into his car after leaving federal court, October 30, 2017 in Washington, DC. Paul Manafort and Rick Gates, have been indicted by a federal grand jury in the investigation into Russian meddling in the U.S. election. (Photo by Drew Angerer/Getty Images)
Paul Manafort, former campaign manager for US President Donald Trump, leaves the E. Barrett Prettyman United States Court House after being charged October 30, 2017 in Washington, DC. President Donald Trump's former campaign chairman Paul Manafort pleaded not guilty Monday to charges of conspiracy and money laundering after the Justice Department unveiled the first indictments in the probe into Russian election interference. Manafort, 68, and business partner Rick Gates, 45, both entered not guilty pleas in a Washington court after being read charges that they hid millions of dollars they earned working for former Ukrainian politician Viktor Yanukovych and his pro-Moscow political party. / AFP PHOTO / Brendan Smialowski (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
Paul Manafort, former campaign manager for Donald Trump, right, exits the U.S. Courthouse in Washington, D.C., U.S., on Monday, Oct. 30, 2017. The federal investigation into whether President Trump's campaign colluded with Russia took a major turn Monday as authorities charged three people a former campaign chief, his business associate and an ex-policy adviser -- with crimes including money laundering, lying to the FBI and conspiracy. Photographer: Zach Gibson/Bloomberg via Getty Images
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FBI Special Agent Brock Domin, in a declaration filed with Mueller's motion, said Manafort had attempted to call, text and send encrypted messages in February to two people from "The Hapsburg Group," a firm he worked with to promote the interests of Ukraine.

The FBI has documents and statements from the two people, as well as telephone records and documents recovered through a search of Manafort's iCloud account showing that Trump's former campaign manager attempted communication while he was out on bail, according to Domin.

The communications were "in an effort to influence their testimony and to otherwise conceal evidence," Domin wrote. "The investigation into this matter is ongoing."

Manafort is the most senior member of Trump's campaign to be indicted, though the charges do not relate to campaign activities.

Trump has denied collusion with Russia and called Mueller's investigation a "witch hunt."

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Trump's former campaign manager Paul Manafort through the years
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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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(Reporting by Eric Beech; Editing by Sandra Maler)

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