NextGen America's Tom Steyer was among those who will be speaking at the rally. He's a big-time Democratic donor and environmentalist from the Bay Area who recently launched a new campaign calling for the president's impeachment.
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Steyer is behind the multi-million dollar effort that's generating a lot of buzz. In a newly-released commercial, Steyer calls on the public to sign a petition urging Congress to take action.
"This president is a clear and present danger," says Steyer in the video. "Tell your member of Congress they have a moral responsibility to stop doing what's political."
Steyer's message is resonating with those who feel like their voices haven't been heard since the election last fall.
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The Republican National Committee calls the campaign a baseless, radical effort.
For this current campaign, Steyer plans to buy more than $10 mil. in digital and television ad space in New York and California, as well as cable television.
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