Senate panel subpoenas Donald Trump Jr.

The Republican-led Senate Intelligence Committee has subpoenaed Donald Trump Jr.Donald (Don) John TrumpTrump Jr. slams Republican committee chairman: 'Too weak to stand up to the Democrats' #TrumpTantrum spreads on Twitter after impromptu press conference Trump family members will join state visit to UK MORE in connection with the panel’s Russia investigation, the first known congressional subpoena to one of President TrumpDonald John TrumpPapadopoulos on AG's new powers: 'Trump is now on the offense' Pelosi uses Trump to her advantage Mike Pence delivers West Point commencement address MORE’s children.

Axios first reported the subpoena, and a source confirmed it to The Hill.

Trump Jr. already testified behind closed doors before the House and Senate Intelligence panels in December 2017 as part of their investigations into Moscow's interference in the 2016 election. Neither committee has released a transcript of his closed-door hearing.

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The president’s eldest son also testified to the Senate Judiciary Committee in September 2017, telling lawmakers that he was “peripherally aware” of plans to expand his father’s businesses into Russia, according to a transcript that was later released by the committee.

Trump Jr.’s testimony has fallen under scrutiny, particularly after the president’s former personal attorney Michael CohenMichael Dean CohenTrump goes scorched earth against impeachment talk Trump's nastiest break-ups: A look at the president's most fiery feuds Cohen challenges Sekulow to testify about Trump Tower meetings MORE claimed in his February testimony to the House Oversight and Reform Committee that Trump Jr. was far more involved in the Moscow Trump Tower project and that he briefed both Trump Jr. and Ivanka TrumpIvana (Ivanka) Marie TrumpTrump family members will join state visit to UK The Hill's 12:30 Report: Trump blows up meeting after Pelosi 'cover up' remarks Trump adviser expected to leave White House, join Juul MORE on the project about 10 times.

Cohen, who pleaded guilty last November to lying about discussions on the Moscow plans within the Trump Organization, delivered marathon closed-door testimony before the Senate Intelligence Committee a day before his House appearance.

A Senate Intelligence spokesperson would not confirm the subpoena, but noted in a statement to The Hill that the panel has “reserved the right to recall witnesses for additional testimony as needed.”

"We do not discuss the details of witness engagements with the Committee," the spokesperson said.

It was not immediately clear how Trump Jr. would respond to the subpoena. His attorney, Alan Futerfas, did not immediately return a request for more information.

A source close to Trump Jr. criticized Democrats for issuing the subpoena, noting that he had already appeared voluntarily before the Senate Intelligence Committee.

"Don is a private citizen, who has already been cleared by Mueller after a two-year investigation," the source said, referring to special counsel Robert MuellerRobert (Bob) Swan MuellerThe Hill's 12:30 Report: Trump orders more troops to Mideast amid Iran tensions Trump: Democrats just want Mueller to testify for a 'do-over' Graham: Mueller investigation a 'political rectal exam' MORE.

"He has done 8-9 hours of testimony in front of Senate Intel already and 27 hours of testimony in front of various committees in total," the source said.

The source also took a shot at the panel's chairman, Sen. Richard BurrRichard Mauze BurrFive takeaways from Barr's new powers in 'spying' probe The Hill's Morning Report — After contentious week, Trump heads for Japan Trump Jr. slams Republican committee chairman: 'Too weak to stand up to the Democrats' MORE (R-N.C.), by arguing that he should have stood up to ranking member Mark WarnerMark Robert WarnerTrump declassification move unnerves Democrats Hillicon Valley: Assange hit with 17 more charges | Facebook removes record 2.2B fake profiles | Senate passes anti-robocall bill | Senators offer bill to help companies remove Huawei equipment Senators offer bipartisan bill to help US firms remove Huawei equipment from networks MORE (D-Va.) and not insisted on additional testimony from Trump Jr.

"When he originally agreed to testify in front of the Senate Intel Committee in 2017, there was an agreement between Don and the Committee that he would only have to come in and testify a single time as long as he was willing to stay for as long as they’d like, which Don did," the source said.

"Don continues to cooperate by producing documents and is willing to answer written questions, but no lawyer would ever agree to allow their client to participate in what is an obvious PR stunt from a so-called 'Republican' senator too cowardly to stand up to his boss Mark Warner and the rest of the resistance Democrats on the committee."

The Senate Intelligence panel has been conducting its investigation into Russia's election interference since January 2017, and Burr has signaled he expects the probe to wrap up in the coming months as the panel finishes interviewing additional witnesses.

Trump son-in-law and senior adviser Jared KushnerJared Corey KushnerNational commission needed to monitor and combat anti-Semitism Trump pushing for GOP donor's company to get border wall contract: report Trump family members will join state visit to UK MORE was spotted returning to the committee for closed-door testimony in late March, reportedly in connection with the Russia investigation.

The Senate probe has run parallel to special counsel Robert Mueller’s Russia investigation, which concluded on March 22 without a recommendation of further indictments.

Mueller did not establish that members of the Trump campaign conspired with the Russian government and did not reach a conclusion on whether Trump obstructed justice.

Trump Jr., who did not speak with the special counsel, was featured in the report, including in a section detailing his involvement in a June 2016 meeting between the campaign and a Kremlin-backed lawyer at Trump Tower.

—Jonathan Easley contributed.