Former Rep. Beto O’Rourke (D-Texas), who officially announced his 2020 presidential bid Thursday, responded to 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’s mocking of his hand movements by suggesting that voters are seeking "to rise above the pettiness" in political discourse.

“I have nothing to say to that," O'Rourke said in response to a question about Trump's criticism earlier Thursday.

"I think people want us to rise above the pettiness, the smallness — they want us to be big, bold, ambitious for this country. That's what I'm focused on and that's what I see here today in Burlington,” he said during a campaign stop in Burlington, Iowa.

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Trump referenced O’Rourke’s hand movements in response to a question 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?’” Trump asked in the Oval Office, referring to a video of O'Rourke campaigning in Iowa, where he waved and shook his hands emphatically as he spoke.

O'Rourke joined a crowded field Thursday of over a dozen Democrats hoping to take on Trump next year in the race for the White House. He joins Sens. 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.), 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.) and 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.), among others, in seeking the Democratic Party’s 2020 presidential nomination.

The former congressman served three terms in the lower chamber before mounting 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) in 2018. O'Rourke drew the attention of former Obama advisers, Oprah Winfrey and key Democratic donors with his fundraising prowess and narrow loss to Cruz in deep-red Texas.