Sen. Richard Blumenthal (D-Conn.) is vowing to block the nominee for deputy attorney general unless he promises to appoint a special prosecutor to investigate Russia's reported involvement with the presidential election.

"I'll use every possible tool to block DOJ Deputy AG nominee unless he commits to appoint independent special prosecutor,” Blumenthal, a member of the Senate Judiciary Committee, tweeted on Sunday evening.

I'll use every possible tool to block DOJ Deputy AG nominee unless he commits to appoint independent special prosecutor — Richard Blumenthal (@SenBlumenthal) March 5, 2017

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The confirmation hearing for the nominee for deputy attorney general, Rod Rosenstein, is scheduled for 10 a.m. on Tuesday before the Senate Judiciary Committee.

Blumenthal is one of two Democrats on the committee who has urged Attorney General Jeff Sessions Jefferson (Jeff) Beauregard SessionsTrump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status White House officials voted by show of hands on 2018 family separations: report MORE to return to the panel to explain his conversations with the Russian ambassador.

Sessions announced during a press conference last week that he would recuse himself from any investigations related to Russia's connection to Donald Trump’s presidential campaign.

Following Sessions's recusal, focus has turned on secondary leaders within the Department of Justice, potentially including Rosenstein, who may lead the probe into President Trump Donald John TrumpBarr criticizes DOJ in speech declaring all agency power 'is invested in the attorney general' Military leaders asked about using heat ray on protesters outside White House: report Powell warns failure to reach COVID-19 deal could 'scar and damage' economy MORE and his associates' connections with Russian officials.

The George W. Bush-appointed U.S. attorney for Maryland is expected to be grilled by the committee's ranking Democrat, Dianne Feinstein Dianne Emiel FeinsteinSenators offer disaster tax relief bill Democrats back away from quick reversal of Trump tax cuts Congress must save the Postal Service from collapse — our economy depends on it MORE (Calif.), and Sens. Blumenthal, Al Franken Alan (Al) Stuart FrankenPeterson faces fight of his career in deep-red Minnesota district Getting tight — the psychology of cancel culture Tina Smith wins Democratic Senate primary in Minnesota MORE (D-Minn.) and Dick Durbin Richard (Dick) Joseph DurbinSenate Republicans signal openness to working with Biden Top GOP senator calls for Biden to release list of possible Supreme Court picks GOP ramps up attacks on Democrats over talk of nixing filibuster MORE (D-Ill.) about how he might handle any such probes into Russia's election involvement.