Sen. Elizabeth Warren Elizabeth WarrenBiden's fiscal program: What is the likely market impact? Warren, Schumer introduce plan for next president to cancel ,000 in student debt The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon MORE (D-Mass.) is urging lawmakers to reject fellow Sen. 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's nomination for attorney general, arguing that the Alabama Republican is "dangerous."

"It's time for the Senate to stand up for the Constitution and exert moral leadership. I will vote against the nomination of Jeff Sessions for Attorney General, and I urge my colleagues to do so as well," Warren said in a statement.

Warren tied her formal opposition to President Trump firing Sally Yates, the former acting attorney general and a holdover from the Obama administration.

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The Democratic senator argued that the Senate formally rejected Sessions's 1986 nomination for a federal judgeship because the GOP lawmaker is "dangerous."

"Now, the President expects the Senate to replace [Yates] with Senator Jeff Sessions — a man whose career has been defined by open hostility to civil rights, immigrants, and the rule of law," Warren said in her statement.

Trump fired Yates on Monday after she said that the Justice Department would not defend Trump's executive order temporarily banning nationals from seven predominantly Muslim countries.

Democrats have blasted the move, with Senate Minority Leader Charles Schumer Chuck SchumerPelosi orders Capitol flags at half-staff to honor Ginsburg Ginsburg in statement before her death said she wished not to be replaced until next president is sworn in Democrats call for NRA Foundation to be prohibited from receiving donations from federal employees MORE (D-N.Y.) calling it a "Monday-night massacre."

Warren added on Tuesday that Trump "fired the nation's top law enforcement officer for refusing to defend an illegal, unconstitutional and deeply immoral order."

Democrats aren't expected to be able to ultimately block Sessions's nomination. He will only need a simple majority, and Republicans hold 52 seats. Democrat Sen. Joe Manchin Joseph (Joe) ManchinBiden promises Democratic senators help in battleground states Senate leaders quash talk of rank-and-file COVID-19 deal OVERNIGHT ENERGY: House Democrats tee up vote on climate-focused energy bill next week | EPA reappoints controversial leader to air quality advisory committee | Coronavirus creates delay in Pentagon research for alternative to 'forever chemicals' MORE (W.Va.) will also support him.