ACLU vows to sue Sessions if he violates Constitution as attorney general
© Greg Nash

The American Civil Liberties Union (ACLU) vowed to sue Jeff SessionsJefferson (Jeff) Beauregard SessionsPress: Mueller closes in on Trump Mueller's findings don't matter The Hill's Morning Report — Trump shakes up staff with eye on 2020, Mueller probe MORE if he violates the Constitution immediately after he was confirmed by the Senate as attorney general.

“If he violates the Constitution, we’ll sue,” the ACLU tweeted on Wednesday night.

The ACLU launched the first successful lawsuit against the Trump administration in late January when it filed a complaint on behalf of two men who were detained at an airport as a result of Trump’s controversial executive order barring travel from seven predominantly Muslim countries to the U.S. 

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A federal judge filed an emergency stay on parts of the executive order at the time as a result.

The group has received a flood of donations and is setting itself up as one of the key players in coming legal fights over Trump's agenda.

Sessions was confirmed by the Senate after a contentious all-night debate about his nomination. Sessions, a Republican senator from Alabama, was eventually confirmed in a 52-47 vote.

The vote came after Sen. Elizabeth WarrenElizabeth Ann WarrenGillum to speak at gathering of top Dem donors: report O'Rourke edges out Biden in MoveOn straw poll Dems ask if Trump aide Bill Shine is breaking ethics laws MORE (D-Mass.) was barred from speaking on the Senate floor against Sessions Tuesday night. Senate Majority Leader Mitch McConnellAddison (Mitch) Mitchell McConnellOval Office clash ups chances of shutdown On The Money: Trump, Dems battle over border wall before cameras | Clash ups odds of shutdown | Senators stunned by Trump's shutdown threat | Pelosi calls wall 'a manhood thing' for Trump Mellman: Enemies of democracy MORE (R-Ky.) said her speech, in which she was reading a letter by the late civil rights activist Coretta Scott King against Sessions's federal judgeship nomination in the 1980s, was impugning another member of the Senate.