Senators are reviving the fight over the whistleblower complaint at the center of the months-long impeachment effort against President Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE.

With Trump’s trial in the rearview mirror, the Senate Intelligence Committee is quietly shifting its attention back to its investigation into the complaint process after hitting pause on the inquiry as the impeachment effort consumed Washington.

The probe will force senators to decide if, and how, they speak with the whistleblower — a controversial call that could test the bipartisan reputation the Intelligence panel has maintained even amid deeply partisan fights in Congress.

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Asked by The Hill if he was willing to formally compel and subpoena the whistleblower to testify, Senate Intelligence Committee Chairman 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.) didn’t rule out the possibility.

“I think you can rest assured that I’m prepared to do whatever we have to to interview the whistleblower,” Burr said.

The renewed interest in speaking with the whistleblower comes after committee staff and lawyers for the individual hit a stalemate late last year over potential questioning.

Lawyers for the individual made offers at the time to both the House and Senate Intelligence committees that their client was willing to provide written answers under oath, but Burr rejected that offer.

The North Carolina senator indicated no progress had been made since then in trying to reach a deal on testimony and that while he hadn’t spoken recently with Mark Zaid, one of the whistleblower’s lawyers, his plan is “an interview with committee staff.”

The timeline for the panel's investigation is unclear. It is still wrapping up two final reports on the probe into Russian election interference in 2016. Asked about a timeline for trying to speak with the whistleblower, Burr said, “Sooner rather than later.”

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How the panel moves forward with trying to speak with the whistleblower could spark tensions among committee leadership — and even among Republicans, as several senators have urged protection for the individual even as some of their colleagues have tried to out their alleged identity.

Sen. Mark Warner Mark Robert WarnerIntelligence chief says Congress will get some in-person election security briefings Overnight Defense: Trump hosts Israel, UAE, Bahrain for historic signing l Air Force reveals it secretly built and flew new fighter jet l Coronavirus creates delay in Pentagon research for alternative to 'forever chemicals' House approves bill to secure internet-connected federal devices against cyber threats MORE (D-Va.), vice chairman of the Intelligence Committee, noted that he and Burr have managed to keep the panel bipartisan despite the politically sensitive nature of their investigations, but he sidestepped on if he was willing to compel the whistleblower.

Warner also declined to weigh in on the public offer from the whistleblower’s attorney of providing answers to questions in writing and under oath.

“Chairman Burr and I are working on how we’re going to go through our proceedings. I’m really proud of the fact that we’ve managed for three and a half years to continue to put out broad, bipartisan reports,” Warner said. “I’m not going to get into any details on what we’re going to do. ... We’ve been pretty close to the vest.”

A Democratic committee source said that protecting the whistleblower's safety and anonymity “is a top priority.”

“We do not expect to be asked to cooperate with any effort that might endanger his or her safety,” the source said.

The prospect of calling the whistleblower to speak with the committee has been talked up most recently not by a member of the panel but by Senate Judiciary Committee Chairman Lindsey Graham Lindsey Olin GrahamSenate Republicans face tough decision on replacing Ginsburg Democratic senator calls for eliminating filibuster, expanding Supreme Court if GOP fills vacancy What Senate Republicans have said about election-year Supreme Court vacancies MORE (R-S.C.), a close ally of the president.

“The Senate Intel Committee under Richard Burr has told us that we will call the whistleblower,” Graham said earlier this month during a Fox News interview.

He added in a subsequent interview with CBS’s “Face the Nation” that the “whistleblower episode needs to be investigated by Richard Burr” and in an interview with Fox News Radio that “the Intel Committee should be looking at whether or not the whistleblower had a bias.”

Sen. Roy Blunt Roy Dean BluntCDC tells Congress it urgently needs billion for vaccine distribution On The Money: Trump undercuts GOP, calls for bigger COVID-19 relief package | Communities of color hit hardest financially by COVID-19 | Businesses, states pass on Trump payroll tax deferral Trump undercuts GOP, calls for bigger COVID-19 relief package MORE (R-Mo.), a member of the Intelligence Committee and GOP leadership, said that he would support subpoenaing the whistleblower if Burr takes that path.

“I’d be supportive of whatever it takes, including a subpoena,” Blunt told The Hill, adding that he also thought the committee “would probably be willing to do this in any reasonable way that the whistleblower would be willing to come forward.”

But Sen. Susan Collins Susan Margaret CollinsSenate Republicans face tough decision on replacing Ginsburg Democratic senator calls for eliminating filibuster, expanding Supreme Court if GOP fills vacancy What Senate Republicans have said about election-year Supreme Court vacancies MORE (R-Maine), asked about Graham’s comments by the Bangor Daily News, appeared wary unless there was a “compelling case.”

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“I am very uncomfortable when I hear about investigations of a whistleblower,” Collins, a member of the Intelligence Committee, told the Maine publication. “We have a law that explicitly protects whistleblowers because they perform an invaluable role in exposing wrongdoing in government.”

The Intelligence Committee investigation, senators stress, isn’t about the identity of the whistleblower who helped spark the impeachment inquiry, but instead reviewing how the complaint was drafted, submitted and subsequently handled by the administration. The panel would also use the review to see if any legislation is needed to change or fill gaps in the process.

The panel met last year with Intelligence Community Inspector General (ICIG) Michael Atkinson, acting Director of National Intelligence (DNI) Joseph Maguire Joseph MaguireCongressional Democrats request FBI briefing on foreign election interference efforts Wells Fargo told employees to delete TikTok from work phones Hillicon Valley: Pompeo floats TikTok ban | Civil rights groups slam Facebook after call | Election security funding included in proposal MORE and other DNI, Justice Department and CIA officials.

“I think we should and will revisit the whistleblower issue, the ICIG and the role they played and even the Justice Department and the role they played,” Blunt told reporters earlier this month. “We may very well want to visit more with the DNI and his staff.”

The whistleblower complaint focuses on Trump's July 25 call with Ukrainian President Volodymyr Zelensky, alleging that Trump sought Ukraine's help in the 2020 election by announcing an investigation into former Vice President Joe Biden Joe BidenSenate Republicans face tough decision on replacing Ginsburg What Senate Republicans have said about election-year Supreme Court vacancies Biden says Ginsburg successor should be picked by candidate who wins on Nov. 3 MORE.

The whistleblower, in the complaint, said that "multiple White House officials with direct knowledge" described the call, including that "the President used the remainder of the call to advance his personal interests. Namely, he sought to pressure the Ukrainian leader to take actions to help the President’s 2020 reelection bid."

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The whistleblower has emerged as a perennial target for Trump and his top allies since news of the complaint emerged last year, raising concerns among advocates and Democrats about the safety and legal protections of whistleblowers.

Tensions over the individual have also flared during — and after — the impeachment trial.

Senate Homeland Security and Governmental Affairs Committee Chairman Ron Johnson Ronald (Ron) Harold JohnsonThe Hill's Morning Report - Sponsored by The Air Line Pilots Association - White House moves closer to Pelosi on virus relief bill Second GOP senator to quarantine after exposure to coronavirus GOP-led panel to hear from former official who said Burisma was not a factor in US policy MORE (R-Wis.) told The Hill last month that he stuck printed out copies of an article about the alleged whistleblower into the cloakroom cubbies of his GOP colleagues.

Sen. Rand Paul Randal (Rand) Howard PaulSecond GOP senator to quarantine after exposure to coronavirus GOP senator to quarantine after coronavirus exposure The Hill's Morning Report - Sponsored by National Industries for the Blind - Trump seeks to flip 'Rage' narrative; Dems block COVID-19 bill MORE (R-Ky.) also grabbed headlines when Supreme Court Chief Justice John Roberts refused to read aloud a question he submitted during the trial that included the name of the alleged whistleblower. Paul subsequently gave a floor speech where he said the name of the individual alleged to be the whistleblower.

Asked about a potential subpoena, Sen. John Cornyn John CornynBipartisan praise pours in after Ginsburg's death Chamber of Commerce endorses McSally for reelection Airline job cuts loom in battleground states MORE (R-Texas), an adviser to Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE (R-Ky.) and a member of the Intelligence Committee, argued that there were “unresolved questions.”

“I think there’s some unresolved questions about the whistleblower, not their identity so much as their contact with HPSCI, HPSCI staff and ... if that was a result of a collaborative process between Mr. Schiff’s staff and the whistleblower, I think that’s something important to know and something we may need to legislate on,” Cornyn said, using the acronym for the House Intelligence Committee.

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House Intelligence Committee Chairman Adam Schiff Adam Bennett SchiffTop Democrats call for DOJ watchdog to probe Barr over possible 2020 election influence Overnight Defense: Top admiral says 'no condition' where US should conduct nuclear test 'at this time' | Intelligence chief says Congress will get some in-person election security briefings Overnight Defense: House to vote on military justice bill spurred by Vanessa Guillén death | Biden courts veterans after Trump's military controversies MORE (D-Calif.) and his staff have said repeatedly that he did not have direct contact with the whistleblower and doesn’t know the individual’s name or the details of the complaint, which the whistleblower’s lawyers have said Schiff had no role in drafting.

Democrats have also noted that whistleblowers routinely reach out to Intelligence committees, before being directed to an investigator general or attorney.

“I don’t know who the whistleblower is. I haven’t met them or communicated with them in any way. The committee staff did not write the complaint or coach the whistleblower what to put in the complaint. The committee staff did not see the complaint before it was submitted to the inspector general,” Schiff told senators during the impeachment trial.

“In short, the conspiracy theory,” he added, “that the whistleblower colluded with the Intel Committee staff to hatch an impeachment inquiry is a complete and total fiction.”