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

The American Civil Liberties Union (ACLU) vowed to sue Jeff SessionsJefferson (Jeff) Beauregard SessionsMeet the senator on Trump's Supreme Court shortlist Trump asked Pruitt to resign in message delivered by Kelly: report Tucker Carlson: Dems are 'plotting a coup' using immigration protests 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.

BREAKING: Jeff Sessions confirmed as attorney general.

If he violates the Constitution, we'll sue. pic.twitter.com/le02tuG2Pg

— ACLU National (@ACLU) February 9, 2017

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. 

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 WarrenWith calls to #AbolishICE, Democrats make a sharp left turn toward their own Midterm Election peril Gloria Allred to Trump after 'Me Too' comments: ‘Keep your hands off Elizabeth Warren’ Elizabeth Warren announces name of new puppy MORE (D-Mass.) was barred from speaking on the Senate floor against Sessions Tuesday night. Senate Majority Leader Mitch McConnellAddison (Mitch) Mitchell McConnellGraham: Trump's Supreme Court picks 'all winners' Trump says he's close to making final Supreme Court decision An end game on Supreme Court nominations 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.