Sen. Elizabeth Warren Elizabeth WarrenDimon: Wealth tax 'almost impossible to do' CNN's Don Lemon: 'Blow up the entire system' remark taken out of context Democrats shoot down talk of expanding Supreme Court MORE (D-Mass.) said Monday that President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE's eldest son, Donald Trump Jr. Don John Trump'Tiger King' star Joe Exotic requests pardon from Trump: 'Be my hero please' Zaid Jilani discusses Trump's move to cancel racial sensitivity training at federal agencies Trump International Hotel in Vancouver closes permanently MORE, must be held accountable regarding a Senate Intelligence Committee subpoena for his testimony.

"No one is above the law," Warren, a 2020 Democratic presidential candidate, told reporters during a campaign stop in Pennsylvania. "Not even the son of the president of the United States."

Sen. Elizabeth Warren in PA: "No one is above the law. Not even the son of the president of the United States." pic.twitter.com/vq75ecrS42 — The Hill (@thehill) May 14, 2019

Warren's campaign did not immediately respond to a request for further comment from the senator.

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The comments appeared to reference the subpoena the GOP-led Senate Intelligence Committee issued Trump Jr. last week. Reuters reported that senators on the panel are hoping to question Trump Jr. about testimony he gave to the Senate Judiciary Committee in September 2017 as part of its own probe into Russia's election interference.

That particular testimony came under scrutiny after Trump's former lawyer, Michael Cohen Michael Dean CohenJudge orders Eric Trump to comply with New York AG's subpoena before Election Day A huge deal for campaign disclosure: Trump's tax records for Biden's medical records Our Constitution is under attack by Attorney General William Barr MORE, testified before Congress in February that Trump Jr. was actively involved in talks to build a Trump Tower in Moscow.

According to a transcript released by the Judiciary committee, Trump Jr. said he was “peripherally aware” of plans to expand his father’s businesses into Russia.

The move to subpoena Trump Jr. was met with criticism from Trump and multiple GOP lawmakers, with some pointing to the testimony Trump Jr. has already given.

Trump Jr. also privately testified before the House and Senate Intelligence panels in December 2017. Neither committee has released a transcript of his closed-door appearances.

Senate Judiciary Committee Chairman Lindsey Graham Lindsey Olin GrahamSenate GOP aims to confirm Trump court pick by Oct. 29: report The Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting Senate GOP sees early Supreme Court vote as political booster shot MORE (R-S.C.) said Monday that Trump Jr. should comply with subpoena but refuse to answer the panel's questions.

“You just show up and plead the Fifth and it’s over with,” Graham told reporters, referring to the amendment that protects citizens from self-incrimination, according to The Washington Post.

The Senate Intelligence Committee, chaired by GOP Sen. Richard Burr Richard Mauze BurrRep. Mark Walker says he's been contacted about Liberty University vacancy Overnight Defense: Trump rejects major cut to military health care | Senate report says Trump campaign's Russia contacts posed 'grave' threat Senate report describes closer ties between 2016 Trump campaign, Russia MORE (N.C.), has been conducting an investigation into Russian interference for more than two years. Burr reportedly told colleagues at a GOP caucus luncheon last week that Trump Jr. had agreed to be interviewed again before backing out.

Sen. Mark Warner (Va.), the top Democrat on the Intelligence Committee, said last week that the panel has been clear that it reserves the “right to bring witnesses back if we have additional questions or there’s inconsistencies.” He did not comment on why the subpoena was issued.