Rep. Jerry Nadler Jerrold (Jerry) Lewis NadlerSchumer: 'Nothing is off the table' if GOP moves forward with Ginsburg replacement Top Democrats call for DOJ watchdog to probe Barr over possible 2020 election influence House passes bill to protect pregnant workers MORE (D-N.Y.), who is set to become the House Judiciary Committee chairman, on Wednesday demanded answers on why 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 submitted his resignation.

"Americans must have answers immediately as to the reasoning behind @realDonaldTrump removing Jeff Sessions from @TheJusticeDept," Nadler tweeted.

"We will be holding people accountable," he added.

Americans must have answers immediately as to the reasoning behind @realDonaldTrump removing Jeff Sessions from @TheJusticeDept. Why is the President making this change and who has authority over Special Counsel Mueller’s investigation? We will be holding people accountable. https://t.co/weykMuiCxm — (((Rep. Nadler))) (@RepJerryNadler) November 7, 2018

"Why is the President making this change and who has authority over Special Counsel [Robert] Mueller’s investigation?" demanded the current ranking Democrat on the committee.

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His comments came moments after Sessions resigned from his post as attorney general, at President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE's request. Trump said in a tweet announcing the decision that Matthew Whitaker, Sessions’ chief of staff, would take over as acting Attorney General.

Trump stated that a permanent attorney general would be named at a later date.

The decision quickly drew scrutiny from Democratic lawmakers over the potential ramifications it could have on 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 probe into Russian election interference, which is being overseen by Deputy Attorney General Rod Rosenstein Rod RosensteinDOJ kept investigators from completing probe of Trump ties to Russia: report Five takeaways from final Senate Intel Russia report FBI officials hid copies of Russia probe documents fearing Trump interference: book MORE.

Sessions had recused himself from overseeing the investigation in 2017.

With the Democrats' retaking the House, Nadler is poised to become the leader of the House Judiciary Committee. The congressman said Tuesday night that Trump was about to learn "that he’s not above the law."

“We’ll see where the Mueller investigation goes,” he added. “I think it’s way too early to talk about impeachment. We have to see what the Mueller investigation comes up with.”

Trump has repeatedly called Mueller's probe a "witch hunt," and on Wednesday said he could fire everybody with ties to if if he wanted.

"But I don't want to stop it because politically I don't like stopping it," he said.