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 (R-N.C.) said Thursday that the Senate Intelligence Committee has made "quite a few referrals" to special counsel Robert Mueller Robert (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 of cases where witnesses questioned in the panel’s Russia probe were suspected of lying, adding he expects there will be more.

“We’ve made quite a few referrals,” Burr, who chairs the Senate panel, told The Hill on Thursday afternoon. “I won’t get into the numbers, but where we have found criminality, we have made those referrals, and I’m sure that they’re not the last."

The Senate GOP chairman first revealed in November that the committee had referred cases of suspected lying to Mueller as the panel investigates Russian interference in the 2016 election and whether members of the Trump campaign coordinated with Moscow.

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His latest comments come after 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 former personal attorney Michael Cohen pleaded guilty last month to lying to the House and Senate Intelligence committees about plans to build a Trump property in Moscow.

Cohen, who also agreed to cooperate in Mueller’s sprawling investigation, has admitted to lying to Congress in order to minimize Trump’s connection to the proposed project and to limit the ongoing Russia probes.

The former Trump lawyer was sentenced to three years in federal prison on Wednesday for other crimes and will serve a two month sentence concurrently for lying to Congress.

A committee aide told The Hill that the panel did not refer Cohen’s case to Mueller. Instead, Mueller was able to review the transcript from Cohen’s interview with the committee in October 2017 after obtaining consent from Cohen’s attorney, the aide said.

The Senate panel has interviewed a slew of witnesses behind closed doors in its Russia investigation over the course of nearly two years, but lawmakers have signaled that they are not finished with the probe.

The panel has requested to interview Cohen again, among others. Burr said Thursday he is “fairly confident” the probe will wrap up in the spring.

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“It’s just a question of how long it takes us to wrap up the remaining folks that we need to interview and those that we need to call back,” Burr said.

It is unclear who the committee believes may have lied during their testimony, or how many referrals the panel has made to the special counsel.

Rep. Adam Schiff Adam Bennett SchiffPelosi, Democrats unveil bills to rein in alleged White House abuses of power Chris Matthews ripped for complimenting Trump's 'true presidential behavior' on Ginsburg Trump casts doubt on Ginsburg statement, wonders if it was written by Schiff, Pelosi or Schumer MORE (D-Calif.), the likely incoming chairman of the House Intelligence Committee, said after Cohen's plea that he believes others lied in their testimony before the House panel in its now-defunct Russia probe.

Since Cohen pleaded guilty, some attention has been paid to the transcript of September 2017 testimony from 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, President Trump’s eldest son, before the Senate Judiciary Committee. Trump Jr. acknowledged then that the discussions about the project within the Trump Organization occurred in 2015 and 2016 but said he was only “peripherally aware” of them.

According to court filings in the case of Trump’s former lawyer, the discussions continued as late at June 2016, at which point Trump was the presumptive Republican nominee for president. Cohen also briefed Trump and members of his family about the project, prosecutors said.

An attorney for Trump Jr. did not immediately return a request for comment.

Trump Jr. testified before the House and Senate Intelligence committees in December 2017. Neither committee has publicly released a transcript his testimony, though the House panel voted to release transcripts of dozens of interviews from its investigation in September. The transcripts, including one from Trump Jr.’s interview, have been passed to the Director of National Intelligence for a classification review.

Others have pleaded guilty to false statements charges in connection with Mueller's probe, such as former national security adviser Michael Flynn and former Trump campaign foreign policy adviser George PapadopoulosGeorge Demetrios PapadopoulosTale of two FBI cases: Clinton got warned, Trump got investigated Trump says he would consider pardons for those implicated in Mueller investigation New FBI document confirms the Trump campaign was investigated without justification MORE, both of whom admitted to lying to FBI agents about their Russia contacts. Flynn is scheduled for sentencing next week.

Meanwhile, Trump has increasingly lashed out at Mueller's investigation, describing it as a partisan-led "witch hunt" and denying there was collusion between the campaign and Moscow.

Correction: A previous version of this story misstated Trump Jr.'s testimony before the Senate Judiciary Committee.