"I said, 'Is he insane or is that just the way he acts?'"
O'Rourke has been discussed as a potential candidate ever since his unexpectedly tight race against Senator Ted Cruz, when his grassroots campaign of inclusion and getting people politically involved gained national attention.
O'Rourke plans to follow his announcement with a trip to Iowa, the state that will hold the first Democratic nominating contest in February 2020.
The trip will serve as the first test of whether O'Rourke can carry to the national political stage the pop-star appeal he showed in Texas previous year, drawing enthusiastic crowds and $80 million in campaign donations.
Beyond a previously announced event in Waterloo, Iowa on Saturday, O'Rourke is expected to visit other towns in eastern Iowa, traditionally a Democratic stronghold, Politico said.
Beto O'Rourke will seek the Democratic nomination to run for USA president, a source close to his campaign and an El Paso TV station said Wednesday. Which current candidate has the most to fear from his run?
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"In Texas, we have a problem with broadband in rural communities", O'Rourke said. "I think people want us to rise above the pettiness, the smallness", O'Rourke told CNN at a later Thursday campaign stop in Burlington, Iowa. "'Whether you meant it or not, I take that as a compliment, ' he says".
O'Rourke revealed during the interview for the April issue that he wanted to run for president, adding that he is "just born to be in it".
In 2018 speculation began that Mr O'Rourke may decide to run after his campaign for the US Senate proved his worth.
The "Tinder moment" wasn't the first time O'Rourke poked fun at himself Thursday, however.
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".