Lawmakers are eyeing a plan to preserve evidence and reports compiled by 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 following Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellPelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Senate GOP aims to confirm Trump court pick by Oct. 29: report Trump argues full Supreme Court needed to settle potential election disputes MORE's (R-Ky.) refusal to bring legislation protecting Mueller's job to the Senate floor.

Sen. Richard Blumenthal (D-Conn.) confirmed to NBC News that some lawmakers were discussing a "Plan B" that would focus on preserving evidence gathered by Mueller in the event that he or 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 is fired.

Talks on such a plan "involve assuring the evidence is preserved and reports are done if the special counsel is fired or other political interference is undertaken by the president," Blumenthal told NBC News.

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Blumenthal said that some Republican senators are also involved in the discussions.

The push for a backup plan to protect Mueller's work comes amid concerns by some lawmakers that 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 could dismiss Rosenstein, who oversees Mueller's investigation into Russian meddling in the 2016 election, or the special counsel himself.

If Rosenstein were fired and replaced with someone Trump considers to be more loyal, that person could choose to limit Mueller's resources, for instance, or withhold the special counsel's final report altogether.

Some lawmakers have proposed legislation aimed at making it harder for Trump to fire Mueller. House Republicans have shot down the possibility of considering such a measure.

Some conservatives have argued that such a measure is unconstitutional because it interferes with Trump's presidential authority to make personnel changes within the executive branch.

The Senate Judiciary Committee voted on a bipartisan basis last month to approve a bill that would allow Mueller to appeal a possible firing before a panel of judges. But McConnell has refused to bring the legislation to a vote in the full Senate.

Trump has bristled both publicly and privately at Mueller's investigation, insisting that there was no coordination between his campaign and Russia, and calling the probe a "witch hunt" and a "hoax." The president's rhetoric on the investigation has prompted concerns by many lawmakers that Trump could seek to end it altogether by dismissing those responsible for leading it.