Tom Steyer officially announces presidential bid - CNN
The 2018 House races, which Steyer spent over $100 million on, marked the third consecutive election cycle in which Steyer spent millions supporting Democratic candidates. But it's Steyer's efforts to impeach Trump which have made him the most visible, starring in self-funded television commercials in which he calls on Congress to remove the President from office.
Steyer joins a crowded Democratic primary that has already participated in the first round of primary debates.
Steyer's late entry to the race makes it highly unlikely that he will qualify for the second round of Democratic debates hosted by CNN, set for the end of July. To make the stage in under three weeks, he'll need to receive campaign contributions from 65,000 individuals and receive 1% support in at least three DNC-approved polls.
In January, Warren said: "No to the billionaires, whether they are self-funding or whether they're funding PACs. We are the Democratic Party, and that is the party of the people. That's how we not only win elections, that's how we build movements that make real change."
And asked about Steyer's possible entry to the race on Monday, Warren said that "every one of us should be held responsible for the kind of campaign we run. Period."
She continued, "I'm careful about what I say about other Democrats, but there's a second part. I don't go to closed-door fundraisers, I don't hang out with millionaires and corporate CEOs. I'm building a grassroots movement and I think as Democrats we should ask that of every single one of them. Do this grassroots style."
Correction: This story has been updated to correctly state the amount Tom Steyer has spent in past election cycles.
CNN's Paul LeBlanc and Dan Merica contributed to this report.