Elizabeth Warren is dropping out of the race for president, a source familiar with the campaign told ABC News Thursday.
So far, she has not yet indicated who she will endorse.
Warren released a statement of remarks to her campaign staff, saying "this fight has not ended."
"So if you leave with only one thing, it must be this: Choose to fight only righteous fights, because then when things get tough - and they will - you will know that there is only option ahead of you. Nevertheless, you must persist," the statement read.
WATCH: WARREN SPEAKS AFTER DROPPING OUT OF PRESIDENTIAL RACE
This news comes after a dismal Super Tuesday for Warren, when the U.S. senator didn't win a single state and finished third in her home state of Massachusetts.
She finished well behind former Vice President Joe Biden, who won the Massachusetts primary, and fellow progressive Vermont Sen. Bernie Sanders, who attracted 10,000-plus people to a rally last weekend on Boston Common.
Warren's campaign had all the early markers of success - robust poll numbers, impressive fundraising and a national organization -- but she was squeezed out by Sanders, who had an immovable base of support among progressives she needed to win over.
Trump, who follows the Democratic nomination fight closely and enjoys stoking divisions within the party, sought to blame Warren for Sanders' lackluster Super Tuesday showing.
"Wow! If Elizabeth Warren wasn't in the race, Bernie Sanders would have EASILY won Massachusetts, Minnesota and Texas, not to mention various other states," he tweeted. He added: "She may very well go down as the all time great SPOILER!
Warren's dropping out of the race comes the same week as former contenders Minnesota Sen. Amy Klobuchar, South Bend Mayor Pete Buttigieg and billionaire businessman Mike Bloomberg dropped out of the race. All three have since endorsed Biden.
Another former contender, entrepreneur Andrew Yang, tweeted that Warren is an "amazing leader" moments after the news broke.
"Always gracious, warm, brilliant and genuine. Everyone knows you were in the race to make things better for everyday people. You will continue to fight because it is who you are," the tweet read.
The Associated Press contributed to this report.