Senate panel subpoenas Donald Trump Jr.

The Republican-led Senate Intelligence Committee has subpoenaed Donald Trump Jr.Don John TrumpGianforte halts in-person campaigning after wife, running mate attend event with Guilfoyle Trump Jr. knocks CNN's Chris Cuomo over interview with father: 'I'm not pretending to be a journalist' Trump Jr. to interview president for reelection campaign's online show 'Triggered' MORE in connection with the panel’s Russia investigation, the first known congressional subpoena to one of President TrumpDonald John TrumpTrump second-term plans remain a mystery to GOP Trump to hold outdoor rally in New Hampshire on Saturday Eighty-eight years of debt pieties 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 CohenBarr to testify in House oversight hearing next month Stone received 'favorable treatment' because of relationship with Trump, former prosecutor will testify Nadler to subpoena AG Barr over Berman firing 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 says he's 'all for masks' despite reluctance to wear one Trump signs order directing federal government to focus on skills when hiring Trump to return to rally stage in controversial style 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) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout 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 BurrBiden campaign adds staff in three battleground states Exclusive investigation on the coronavirus pandemic: Where was Congress? Trump asserts his power over Republicans MORE (R-N.C.), by arguing that he should have stood up to ranking member Mark WarnerMark Robert WarnerSenators press IRS chief on stimulus check pitfalls Hillicon Valley: Facebook takes down 'boogaloo' network after pressure | Election security measure pulled from Senate bill | FCC officially designating Huawei, ZTE as threats Overnight Defense: Democrats blast Trump handling of Russian bounty intel | Pentagon leaders set for House hearing July 9 | Trump moves forward with plan for Germany drawdown 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 KushnerTrump sealed his own fate The Hill's Morning Report - Republicans shift, urge people to wear masks Mueller investigation witness George Nader sentenced to a decade in prison in child sex case 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.