O'Rourke, who gained a national following with his long-shot election battle against U.S. Senator Ted Cruz previous year, will make his announcement via video on social media at 7:30 a.m. EDT (1130 GMT), a source close to the campaign said. He lost his only tilt at the Senate to one of the most divisive Republicans in America, Ted Cruz.
"I could care less about your party persuasion", O'Rourke said.
After Cruz defeated O'Rourke, the former congressman revealed that he was mulling over running for president in 2020, despite repeatedly claiming that it was a "definitive no" regarding whether he would run or not. "I don't think anybody in that race knows what it's like".
O'Rourke's Senate loss was the closest a Texas Democrat has come tobeating a Republican incumbent senator since 1978.
Soon after his loss, O'Rouke began pollingnear the top of the Democratic field as early as December, before anyone had announced their bids. "He could be a good candidate for Kamala Harris to add to the ticket", Branham said. But the Spanish-speaking, 46-year-old former punk rocker used grassroots organizing and social media savvy to mobilize young voters and minorities and get within 3 percentage points of winning in the nation's largest red state.More news: Taiwan suspends operations of Boeing 737 MAX aircraft | Economics
More news: Pelosi says Trump 'just not worth' impeaching
More news: Google employee breaks record, calculates 31.4 trillion digits of Pi
According to the latest edition of Vanity Fair, Mr O'Rourke said: "You can probably tell that I want to run. I do".
"We shared a common goal", said Ted Houghton, a local financial adviser and longtime O'Rourke donor who raised money for former GOP Texas Gov. Rick Perry, and helped steer millions in state transportation funding to the city.
Of late, O'Rourke has tried to distance himself from some left-leaning candidates, such as Sanders and Senator Elizabeth Warren of MA, whom Trump has derided as "socialists".
"This is a defining moment of truth for this country and for every single one of us", O'Rourke said in a video announcing his candidacy.