President Trump said Thursday newly minted 2020 presidential candidate Beto O’Rourke used “a lot of hand movement” in video O'Rourke released earlier in the day announcing his campaign.

“I think he’s got a lot of hand movement,” the president said at the White House during an appearance with the Irish Prime Minister Leo Varadkar. “I’ve never seen so much hand movement. I said, ‘Is he crazy or is that just the way he acts?’”

It was a characteristic personal attack by Trump on one of his political opponents. On the campaign trail in 2016, for example, Trump took a shot at Florida Sen. Marco Rubio’s height, calling him “Little Marco Rubio.” He also mocked former Florida governor Jeb Bush, calling him “low energy.”

In the video, O’Rourke continuously gesticulates with one arm while describing his reasons for entering the race.

“I’ve actually never seen anything quite like it,” Trump added, mocking O’Rourke’s gestures. “Study it. I’m sure you’ll agree.”

O’Rourke took a long time to announce his candidacy, heightening anticipation by repeatedly dropping hints he would get in the race. In February, he held a rally in El Paso, Texas, to build support. On March 9, he released “Running with Beto,” a documentary about his Senate run. At one point recently, he said he would make a special announcement about his 2020 plans “soon.” And in a Vanity Fair article published Wednesday night, the former Texas representative said, “I’m just born to do this,” referring to holding the office of president.

The official announcement finally came this morning, when O’Rourke released a video in which he appeared with his wife.

“Amy and I are happy to share with you that I am running to serve you as the next president of the United States of America,” O’Rourke said. "This is a defining moment of truth for this country and for every single one of us. The challenges that we face right now, the interconnected crises in our economy, our democracy and our climate have never been greater."

O’Rourke will stage a "kick off" campaign rally on March 30 in El Paso.

[Opinion: Beto O'Rourke won't win, but here's how he could disrupt the 2020 Democratic race]