Senate Minority Leader Charles Schumer Chuck SchumerSenate Democrats introduce legislation to probe politicization of pandemic response Schumer interrupted during live briefing by heckler: 'Stop lying to the people' Jacobin editor: Primarying Schumer would force him to fight Trump's SCOTUS nominee MORE (D-N.Y.) on Wednesday warned that attempts by 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 or a successor to 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 to interfere in 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 would spark a “constitutional crisis.”

"I'd say this: Protecting Mueller and his investigation is paramount,” Schumer told reporters during a previously scheduled press conference. “It would create a constitutional crisis if this were a prelude to ending or greatly limiting the Mueller investigation and I hope President Trump and those he listens to will refrain from that.”

Schumer was peppered with questions about the attorney general's exit minutes after Sessions was ousted from the top Justice Department spot. In his resignation letter, Sessions said he was submitting his resignation at Trump's request.

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Sessions and Trump have had a frayed relationship for months, but firing him sparked immediate concerns by Schumer and other Democrats that it could be an effort to interfere in Mueller's investigation into potential collusion between Russia and the Trump campaign. Trump has lashed out at the probe, decrying it as a “witch hunt.”

Sessions recused himself from the Russia investigation shortly after being sworn in as attorney general, putting 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 in charge of the probe.

Schumer, asked if he had any requirements for a new attorney general nominee, demurred, saying he wanted to view the details of Sessions's dismissal, after being told about the news during the press conference.

"I'm not going to say much until I read what they said and why. I find the timing very suspect, number one," Schumer said, before adding that any attorney general "should not be able to interfere with the Mueller investigation in any way."

Democrats are limited in their ability to block Trump's nominees. An attorney general nominee would only need a simple majority in the Senate, meaning Democrats would need to remain united and win over a handful of Republicans to be successful in blocking a nomination.

Instead, Democrats have for months called for Congress to pass legislation that would protect Mueller if he is fired. But GOP leadership has dismissed the need for such a bill and Democrats are powerless to muscle through the proposal on their own.

Several House Democratic lawmakers quickly renewed their calls to protect Mueller on Wednesday, one day after the party took back the majority in the House.

Rep. Jerrold Nadler (D-N.Y.), who will likely become the chairman of the House Judiciary Committee, questioned the timing of Sessions's dismissal.

"Why is the President making this change and who has authority over Special Counsel Mueller’s investigation? We will be holding people accountable," he said in a tweet.

Rep. Lou Correa Jose (Lou) Luis CorreaCriminalization that never should have been: Cannabis Man arrested, charged with threatening to attack Muslims in Germany Gloves come off as Democrats fight for House seat in California MORE (D-Calif.) added that it's "imperative" that whoever Trump picks to succeed Sessions "vows to continue and protect the ongoing investigation."

And Sen. Ed Markey Edward (Ed) John MarkeySchumer: 'Nothing is off the table' if GOP moves forward with Ginsburg replacement Democrats see fundraising spike following Ginsburg death Democratic senator calls for eliminating filibuster, expanding Supreme Court if GOP fills vacancy MORE (D-Mass.) doubled down on calls for the Mueller legislation and raised concerns that Rosenstein could be Trump's next target.

"Sessions faithfully carried out Trump's extremist agenda. Yet Trump fired him before all the midterm ballots have been counted. If Trump tries to fire Deputy AG Rosenstein next, it will trigger a constitutional crisis. Now more than ever we must protect Special Counsel Mueller," he said in a tweet.