Acting Director of National Intelligence Joseph Maguire and Michael Atkinson, the intelligence community inspector general, will meet with the Senate Intelligence Committee on Thursday, according to the top Democrat on the panel.

Sen. Mark Warner Mark Robert WarnerFBI director casts doubt on concerns over mail-in voting fraud Democrats call for declassifying election threats after briefing by Trump officials It's time to upgrade benefits MORE (D-Va.) told reporters on Tuesday that the two men will brief the Senate committee separately in the wake of a whistleblower complaint reportedly linked to President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE's actions toward Ukraine.

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A spokeswoman for committee Chairman Richard Burr Richard Mauze BurrHillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns Bipartisan representatives demand answers on expired surveillance programs Rep. Mark Walker says he's been contacted about Liberty University vacancy MORE (R-N.C.) declined to comment beyond a Monday statement that the GOP senator was working to set up briefings. The Senate Intelligence Committee has two closed-door briefings on its calendar for Thursday.

Atkinson met with the House Intelligence Committee last week. Though he disclosed that the whistleblower complaint was based on multiple incidents, he would not discuss its details with lawmakers.

Maguire is also expected to testify before the House Intelligence Committee on Thursday.

The whistleblower complaint and reports that Trump and his personal lawyer Rudy Giuliani Rudy GiulianiThe Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting CIA found Putin 'probably directing' campaign against Biden: report Democrats fear Russia interference could spoil bid to retake Senate MORE pressed Ukraine to investigate former Vice President Joe Biden and his son have fueled new impeachment calls from Democrats.

Democrats are also clamoring for administration officials to turn over the whistleblower complaint to Congress, which they've refused to do.

Asked on Tuesday if he thought lawmakers would have the complaint by the time they have the two briefings later in the week, Warner demurred, saying they "are still working through" issues.

Updated at 12:42 p.m.