The video showed snippets of comments Omar made last month at a banquet for a Muslim civil rights organization interspersed with footage of the twin towers burning.

“WE WILL NEVER FORGET!” Trump tweeted, along with the video.

House Speaker Nancy Pelosi (D-Calif.) denounced the use of the imagery in a statement Saturday morning from Germany, where she is visiting troops.

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“The memory of 9/11 is sacred ground, and any discussion of it must be done with reverence,” Pelosi said. “The President shouldn’t use the painful images of 9/11 for a political attack.

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“As we visit our troops in Stuttgart to thank them and be briefed by them, we honor our first responsibility as leaders to protect and defend the American people,” the statement continued. “It is wrong for the President, as Commander-in-Chief, to fan the flames to make anyone less safe.”

On Thursday, the New York Post had helped set the tone for the president’s tweet by publishing a front page that showed her comments over a similar image.

The remarks in question came in March, as Omar, one of the first two Muslim women elected to Congress, spoke about Islamophobia at an event held by the Council on American-Islamic Relations, a civil liberties group. The shooting that left 50 Muslim worshipers dead at two mosques in New Zealand, allegedly at the hands of a white supremacist, had occurred the week before.

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“For far too long, we have lived with the discomfort of being a second-class citizen and, frankly, I’m tired of it, and every single Muslim in this country should be tired of it,” she said in the middle of a roughly 20-minute long speech. “CAIR was founded after 9/11 because they recognized that some people did something and that all of us were starting to lose access to our civil liberties. So you can’t just say that today someone is looking at me strange and that I am trying to make myself look pleasant. You have to say that, ‘This person is looking at me strange. I am not comfortable with it, and I am going to talk to them and ask them why.’ Because that is the right you have.”

The speech had drawn a protest outside and even news coverage from conservative-leaning outlets such as the Washington Times, which noted that she told fellow Muslims to “raise hell” and “make people uncomfortable” as they seek to defend their rights.

But this week, conservatives began to fixate on the four words she used to refer to 9/11: “Some people did something.”

The comments were the focus of harsh broadsides from people like Rep. Dan Crenshaw (R-Tex.), Republican National Committee Chairwoman Ronna McDaniel, Donald Trump Jr. and “Fox & Friends” host Brian Kilmeade, who questioned whether Omar, a Somali refuge, was “an American first.”

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After the New York Post put Omar’s comments on such an incendiary cover, some liberals began to speak up against it, saying they felt it was an incitement to violence against Omar, who has been the target of threats and overt Islamophobia.

“Such an ungenerous interpretation of her remarks is only possible if one is inclined to believe that Omar sympathizes more with terrorists than her murdered countrymen,” Zak Cheney-Rice wrote for New York magazine. “That she spoke them in the course of decrying Islamophobia makes it especially disconcerting that her political opponents would decontextualize them to fan the flames — she receives regular death threats on the basis of her faith, including from one New York man who threatened recently to ‘put a bullet in her . . . skull.’”

Late Friday night, Democratic presidential candidate Beto O’Rourke seemed to respond to the president’s tweet with a tweet that prompted criticism for being vague and not directly mentioning Omar: “We are stronger than this president’s hatred and Islamophobia. Do not let him drive us apart or make us afraid.”

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But on Saturday morning at a town hall in a seafood restaurant near Charleston, S.C., O’Rourke described the president’s tweet and the video it contained and then denounced it in a monologue that lasted several minutes. As he spoke, many in the crowd gasped or exclaimed at the description, then applauded O’Rourke’s response: that the video is a continuation of rhetoric used by the president and his administration against Mexican immigrants, asylum seekers, Muslims and others.

“There is a cost and there is a consequence to this rhetoric — hate crimes in this country up every single one of the last three years,” he said. “This is an incitement to violence against Congresswoman Omar, against our fellow Americans who happen to be Muslim.”

At the end of a roundtable with voters in Gary, Ind., Sen. Bernie Sanders (I-Vt.) hinted at the controversy over Trump’s attack on Omar, saying that “the function of a president is bringing our people together” and that Trump was failing at that. “Even conservative presidents have understood that,” Sanders said.

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“George W. Bush — I didn’t have a lot in common with him. His views were very different than mine,” Sanders said. “But remember what he did after 9/11? He walked into a mosque to say that criminals, terrorists, attacked the United States. Not the Muslim people. That was a conservative Republican. We now have a president who, for cheap political gain, is trying to divide us up.”

The NAACP said on Twitter: “The President needs to realize that his words have the power to incite hate, violence, and ignorance that is nothing but a detriment to our society.”

Numerous House colleagues came to Omar’s defense, and her fellow freshmen issued a forceful response to Trump’s words. Reps. Alexandria Ocasio-Cortez (D-N.Y.), Ayanna Pressley (D-Mass.) and Rashida Tlaib (D-Mich.) called for more Democrats to speak out to defend her.

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“Members of Congress have a duty to respond to the President’s explicit attack today,” Ocasio-Cortez tweeted. “@IlhanMN’s life is in danger.”

Several Democratic presidential candidates, including Washington Gov. Jay Inslee, former Texas congressman O’Rourke, South Bend, Ind., Mayor Pete Buttigieg and Julián Castro, former secretary of housing and urban development and former San Antonio mayor, condemned the president’s remarks.

Trump has long wielded 9/11 as a political weapon. In the early part of his presidential campaign, he spread a falsehood that “thousands,” of people in New Jersey — where there is a “heavy Arab population,” he said — celebrated as the twin towers came crashing down.

During a primary debate in 2016, he went after rivals like Jeb and Sen. Marco Rubio (R-Fla.) over President George W. Bush’s failure to prevent 9/11.

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“The World Trade Center came down during your brother’s reign. Remember that,” Trump told Jeb Bush.

In 2010, Trump made a highly publicized offer to purchase a contentious site near Ground Zero where developers planned to build an Islamic community center.

Jenna Johnson in South Carolina and David Weigel in Indiana contributed to this report.