Sen. Kamala Harris (D-Calif.) on Tuesday, Dec. 3, announced that she is ending her bid for the 2020 Democratic presidential nomination after failing to capitalize for her campaign. 

“I’ve taken stock and looked at this from every angle, and over the last few days have come to one of the hardest decisions of my life,” Harris said. “My campaign for president simply doesn’t have the financial resources we need to continue.”

Harris, the first woman and first black attorney general and U.S. senator in California’s history, launched her campaign in front of 20,000 people in January in Oakland, California. She raised $12 million in the first three months of her campaign and was a top contender. She marked a breakout moment in the first debate while classing with then-frontrunner Joe Biden over his record on desegregation busing.

But as the field grew, Harris was unable to sustain the momentum, her fundraising remained flat and her poll numbers plunged in recent months. In her note to supporters, Harris lamented the role of money in politics and, without naming them, took a shot at billionaires Tom Steyer and Michael Bloomberg, who are funding their presidential bids.

“I’m not a billionaire,” she said. “I can’t fund my own campaign. And as the campaign has gone on, it’s become harder and harder to raise the money we need to compete.”

Giving confusing policy positions, particularly on health care, Harris suffered from what allies and critics viewed as an inconsistent pitch to voters. Her slogan “For the people” referenced her career as a prosecutor, a record that was viewed skeptically by the party’s most progressive voters.

In recent weeks, as fundraising slowed, Harris’s campaign turned all of its attention to Iowa, laying off campaign staff in other early states.

Harris’s decision to end her White House bid comes days after The New York Times obtained a blistering resignation letter from a former Harris staffer who claimed she had “never seen an organization treat its staff so poorly.”

“Because we have refused to confront our mistakes, foster an environment of critical thinking and honest feedback, or trust the expertise of talented staff, we find ourselves making the same unforced errors over and over,” wrote Kelly Mehlenbacher,  who now works for businessman Bloomberg’s campaign. 

Harris is the first top-tier candidate to drop out the race and the third candidate this week, following  Gov. Steve Bullock (D-Mont.) and former Rep. Joe Sestak (D-Pa.). She remains to the end of her term in the Senate until 2022. fifteen Democrats remain in the race for the nomination.

“To bad. We will miss you Kamala!” President Donald Trump, who is in London for NATO meetings, wrote in a tweet.

Includes reporting from The Associated Press