Senate Majority Leader Mitch McConnell unleashed a new feminist battle cry on the Senate floor on Tuesday. 

"Nevertheless, she persisted."

The Kentucky Senator said these words when he called on an arcane rule to silence Sen. Elizabeth Warren (D-Mass.) in the middle of her speech criticizing attorney general nominee Sen. Jeff Sessions.

Warren was reading a 30-year-old letter from from Dr. Martin Luther King's widow that dated to Sen. Jeff Sessions' failed judicial nomination three decades ago, when McConell made a statement that inspired thousands of tweeets and a trending hashtag #neverthelessshepersisted. 

"Sen. Warren was giving a lengthy speech," he said. "She had appeared to violate the rule. She was warned. She was given an explanation. Nevertheless, she persisted."

RELATED VIDEO: Sen. Warren reads Coretta Scott King's letter on Sessions

Quoting King technically put Warren in violation of Senate rules for "impugning the motives" of Sessions, though senators have said far worse stuff. And Warren was reading from a letter that was written 10 years before Sessions was even elected to the Senate.

Still, top Senate Republican Mitch McConnell invoked the rules. After a few parliamentary moves, the GOP-controlled Senate voted to back him up.
Now, Warren is forbidden from speaking again on Sessions' nomination. A vote on Sessions is expected Wednesday evening.

Democrats seized on the flap to charge that Republicans were muzzling Warren, sparking liberals to take to Twitter to post the King letter in its entirety.

Warren argued: "I'm reading a letter from Coretta Scott King to the Judiciary Committee from 1986 that was admitted into the record. I'm simply reading what she wrote about what the nomination of Jeff Sessions to be a federal court judge meant and what it would mean in history for her."

Warren was originally warned after reading from a statement by former Sen. Edward Kennedy, D-Mass., that labeled Sessions a disgrace.

Democrats pointed out that McConnell didn't object when Sen. Ted Cruz, R-Texas, called him a liar in a 2015 dustup.

The episode was followed by lamentations by Senate veterans, including its most senior Republican, Orrin Hatch of Utah, about how the Senate is too partisan.

The Associated Press contributed to this report.