President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE on Thursday mocked Beto O'Rourke Beto O'RourkeJimmy Carter says his son smoked pot with Willie Nelson on White House roof O'Rourke endorses Kennedy for Senate: 'A champion for the values we're most proud of' 2020 Democrats do convention Zoom call MORE's "crazy" hand movements after the former Texas congressman announced his bid for the 2020 Democratic presidential nomination.

"I think he's got a lot of hand movement," Trump said when asked in the Oval Office about O'Rourke entering the race.

"I've never seen so much hand movement. I said, 'Is he crazy or is that just the way he acts?'" added Trump, who is himself known to be expressive with his hands during campaign rallies and other events.

ADVERTISEMENT

Trump referenced a video of O'Rourke campaigning in Iowa, where the candidate waved and shook his hands emphatically as he spoke.

“I've actually never seen anything quite like it,” Trump said. “Study it. I’m sure you'll agree.”

The president declined to say whether he viewed O'Rourke or former Vice President Joe Biden Joe BidenOmar fires back at Trump over rally remarks: 'This is my country' Trump mocks Biden appearance, mask use ahead of first debate Trump attacks Omar for criticizing US: 'How did you do where you came from?' MORE as a stronger opponent in 2020. Biden has yet to announce whether he'll run for president again, but he is widely expected to do so.

"Whoever it is, I'll take him or her on," Trump said.

O'Rourke officially announced his candidacy for president in a video published Thursday morning, ending months of speculation and joining a steadily growing field of presidential hopefuls.

“This is a defining moment of truth for this country and every single one of us,” O'Rourke said.

I am running to serve you as the next president. The challenges we face are the greatest in living memory. No one person can meet them on their own. Only this country can do that, and only if we build a movement that includes all of us. Say you're in: https://t.co/EKLdkVET2u pic.twitter.com/lainXyvG2n — Beto O'Rourke (@BetoORourke) March 14, 2019

The El Paso Democrat joins Sens. Elizabeth Warren Elizabeth WarrenHarris joins women's voter mobilization event also featuring Pelosi, Gloria Steinem, Jane Fonda Judd Gregg: The Kamala threat — the Californiaization of America GOP set to release controversial Biden report MORE (D-Mass.), Kamala Harris Kamala HarrisButtigieg stands in as Pence for Harris's debate practice First presidential debate to cover coronavirus, Supreme Court Harris joins women's voter mobilization event also featuring Pelosi, Gloria Steinem, Jane Fonda MORE (D-Calif.), Amy Klobuchar Amy KlobucharSocial media platforms put muscle into National Voter Registration Day Battle lines drawn on precedent in Supreme Court fight Sunday shows - Ruth Bader Ginsburg's death dominates MORE (D-Minn.), Cory Booker Cory Anthony BookerBipartisan praise pours in after Ginsburg's death DHS opens probe into allegations at Georgia ICE facility Democratic lawmakers call for an investigation into allegations of medical neglect at Georgia ICE facility MORE (D-N.J.) and Bernie Sanders Bernie SandersButtigieg stands in as Pence for Harris's debate practice Bernie Sanders warns of 'nightmare scenario' if Trump refuses election results Harris joins women's voter mobilization event also featuring Pelosi, Gloria Steinem, Jane Fonda MORE (I-Vt.), among others, in seeking the Democratic Party’s 2020 presidential nomination.

O'Rourke served three terms in Congress before an unsuccessful bid to unseat Sen. Ted Cruz Rafael (Ted) Edward CruzTrump argues full Supreme Court needed to settle potential election disputes Press: Notorious RBG vs Notorious GOP The Hill's Morning Report - Sponsored by Facebook - Washington on edge amid SCOTUS vacancy MORE (R-Texas) last year. O'Rourke is a fundraising stalwart and has earned praise from former Obama advisers, Oprah Winfrey and a couple congressional Democrats.

White House deputy press secretary Hogan Gidley corrected Fox News anchors during an appearance on "America's Newsroom" on Thursday by noting that O'Rourke's given name is Robert Francis. He suggested the president would deploy that as a line of attack on the trail.

"He's called him that before on the campaign trail, and why wouldn't he? That's his name," Gidley said.