He took a well-publicized road trip across the American Southwest, stopping at colleges and diners.
Trump, who became known for slapping derisive nicknames onto opponents during the 2016 campaign, focused on O'Rourke's hands on Thursday when asked about O'Rourke's campaign announcement.
Trump relished the face-off, dismissing the Democrat's crowd size (which was later estimated to be at least as big as Trump's), claiming that this "may be the end of his presidential bid" and that O'Rourke was simply "a young man who's got very little going for himself except a great first name".
However, O'Rourke didn't expand on the issue in his response to Trump's critique. But it was Vanity Fair's April cover, released just hours before his announcement, that really kickstarted the 2020 buzz. In an interview for the piece, the former congressman talked about his presidential ambitions. "I want to be in it", he's quoted as saying. 'Man, I'm just born to be in it, and want to do everything I humanly can for this country at this moment'.
"Beto O'Rourke will have to define himself against a crowded field of Democratic candidates, but he doesn't feel the need to draw blood to define himself". In a unusual response, Trump said, "I think he's got a lot of hand movement".
But O'Rourke is far from a front-runner just yet - with Senator Bernie Sanders of Vermont and former Vice President Joe Biden, who is considering a White House bid, leading polls.
He continued: "But I totally understand people who will make a decision based on the fact that nearly every single one of our presidents has been a white man, and they want something different for this country".
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