Sessions was then a U.S. attorney from Mobile, Alabama, whom Republican President Ronald Reagan nominated for U.S. District judge for the Southern District of Alabama. The GOP-controlled committee ultimately blocked his nomination by a 10-8 vote.
In the letter, King, who died in 2006, also wrote that if Sessions were confirmed, he would be "given life tenure for doing with a federal prosecution what the local sheriffs accomplished twenty years ago with clubs and cattle prods."
Sessions has been criticized for decades-old allegations that he made racist remarks as a federal prosecutor in his home state.
Even then, however, he insisted that he harbored no racial bias and disputed the allegations made against him during hearings on his nomination to be a federal judge.
But quoting King’s letter from the floor Tuesday night, Warren said, "Mr. Sessions has used the awesome power of his office to chill the free exercise of the vote by black citizens in the district he now seeks to serve as a federal judge."
After that, Sen. Steve Daines, R-Mont., the Senate's presiding officer, told his Democratic colleague to "take her seat."
Having been silenced from the Senate floor, Warren took to Facebook Live to read Mrs. King's letter in its entirety without interruption.
Read the letter in full here.