Senate panel subpoenas Donald Trump Jr.

The Republican-led Senate Intelligence Committee has subpoenaed Donald Trump Jr.Donald (Don) John TrumpPETA billboard in Baltimore calls Kushner a 'rich pest' Dick Cheney to attend fundraiser supporting Trump reelection: report House chairman warns foreign governments to 'cease and desist' spending money at Trump properties MORE in connection with the panel’s Russia investigation, the first known congressional subpoena to one of President TrumpDonald John Trump Former US ambassador: 'Denmark is not a big fan of Donald Trump and his politics' Senate Democrats push for arms control language in defense policy bill Detroit county sheriff endorses Booker for president 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 CohenCapitol Police advised Gaetz against holding open events I'm not a Nazi, I'm just a dude: What it's like to be the other Steve King Wyden blasts FEC Republicans for blocking probe into NRA over possible Russia donations 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 TrumpPresident tweets 'few work harder' than Ivanka, Jared Dick Cheney to attend fundraiser supporting Trump reelection: report Trump Jr. dismisses conflicts of interest, touts projects in Indonesia 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 MuellerMueller report fades from political conversation Trump calls for probe of Obama book deal Democrats express private disappointment with Mueller testimony 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 BurrHoekstra emerges as favorite for top intelligence post Trump casts uncertainty over top intelligence role Trump withdraws Ratcliffe as Intelligence pick MORE (R-N.C.), by arguing that he should have stood up to ranking member Mark WarnerMark Robert WarnerFacebook users in lawsuit say company failed to warn them of known risks before 2018 breach New intel chief inherits host of challenges Overnight Defense: US, Russia tensions grow over nuclear arms | Highlights from Esper's Asia trip | Trump strikes neutral tone on Hong Kong protests | General orders ethics review of special forces 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 KushnerPresident tweets 'few work harder' than Ivanka, Jared PETA billboard in Baltimore calls Kushner a 'rich pest' Top immigration aide experienced 'jolt of electricity to my soul' when Trump announced campaign 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.