Rep. Hakeem Jeffries Hakeem Sekou JeffriesPelosi: House will stay in session until agreement is reached on coronavirus relief Races heat up for House leadership posts Postmaster general earned millions from company with ties to Postal Service: report MORE (D-N.Y.) in one of the more pointed moments of a testy hearing on Friday questioned how Matthew Whitaker became President Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE's acting attorney general.

"I'm confused. I really am. We're all trying to figure out, who are you? Where did you come from?" Jeffries, a member of Democratic House leadership seen as a possible future Speaker, asked Whitaker during the House Judiciary Committee hearing.

"And how the heck did you become the head of the Department of Justice?" Jeffries stated. "Hopefully you can help me work through this confusion."

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"I assume you know the difference," he said.

It was just the latest confrontational moment of the hearing, one of the first to center on 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's investigation and the legal controversies swirling around Trump since Democrats took over the House.

Whitaker is seen as a Trump loyalist, and he is expected to be replaced as attorney general as soon as William Barr wins confirmation in the Senate. Barr is a former attorney general from former President George H.W. Bush's administration.

Whitaker took the post when Trump fired former Attorney General Jeff Sessions Jefferson (Jeff) Beauregard SessionsGOP set to release controversial Biden report Trump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status MORE, who had recused himself from overseeing the Russia investigation — earning Trump's wrath in the process.

Jeffries listed former Trump campaign aides who have pleaded guilty in Mueller's probe, naming former Trump campaign chairman Paul Manafort Paul John ManafortOur Constitution is under attack by Attorney General William Barr Bannon trial date set in alleged border wall scam Conspicuous by their absence from the Republican Convention MORE, the president's former personal lawyer Michael Cohen, Trump's former national security adviser Michael Flynn, and his longtime adviser Roger Stone Roger Jason StoneOur Constitution is under attack by Attorney General William Barr Justice IG investigating Stone sentencing: report Romney says Trump's protest tweets 'clearly intended to further inflame racial tensions' MORE.

"Manafort, Gates, Flynn, Cohen, Papadopoulos and Stone are all in deep trouble. One by one, all of the president's men are going down in flames," Jeffries said.

"It is often said where there is smoke, there's fire. There's a lot of smoke emanating from 1600 Pennsylvania Ave. right now."

He also issued a stark warning that Whitaker should not to interfere in Mueller's investigation during his final days as the DOJ's top cop.

"In your final week, keep your hands off the Mueller investigation," Jeffries told Whitaker emphatically, ending his line of questioning with a statement.

"The investigation into Russia's attack on our democracy is not a witch hunt. It's not a fishing expedition. It's not a hoax. It's not a lynch mob. It's a national security. The fact that people suggest otherwise comes dangerously close to providing aid and comfort to the enemy," he added.