The crowd had started chanting "send her back" as Trump had attacked the congresswoman recounting her critical observations on various issues, and had continued speaking as the chant grew louder and had paused to let it continue.
"I deeply disagree with the extreme left & have been disgusted by their tone", said Representative Adam Kinzinger of IL.
"This is about socialism versus freedom", top House Republican Kevin McCarthy told reporters this week. "I believe he is fascist".
The president described his supporters as those who love the country.
Yet Trump's exhortation for the four minority congresswomen to "go back" to their countries of origin, if uttered by an employee in a workplace, could constitute a firing offense or cause for a costly lawsuit.
The first-term lawmakers - all but one of whom, Omar, were born in the United States - are of Hispanic, Arab, Somali and African-American descent.
Trump's campaign advisers have long sought to paint the entire Democratic presidential field as "socialists".
Even by Trump's standards, the campaign rally offered an extraordinary tableau for American politics: a president drinking in a crowd's cries to expel a congresswoman from the country who is his critic and a woman of colour.
They believe they were aided in that effort in last month's Democratic debate when several candidates on stage came out in favour of eliminating private health insurance, and a larger number supported providing healthcare for immigrants in the country illegally, and decriminalising the unauthorised crossing of the US border. Later, she said, "I want to talk about the political influence in this country that says it is OK for people to push for allegiance to a foreign country", specifically Israel. I would say that I was not happy with it.
Despite the uproar over his comments, condemned as "racist" by the Democratic-controlled House of Representatives, Trump exposed the "Squad" congresswomen's past anti-semitic and anti-American comments at a rally in North Carolina on Wednesday, where the chants broke out.
The public infighting prompted handwringing from some Democrats, while others dismissed it as healthy debate about America's future.
At the same time, he is working to make clear to moderate voters that he would be a more palatable alternative than a Democratic nominee more in line with the congresswomen's values, such as U.S. Senator Bernie Sanders. She subsequently apologized to Jewish groups for some of her comments. Alexandria Ocasio-Cortez of NY and Ayanna Pressley of MA.
The back-and-forth captured the potential impacts of Trump's willingness to inject rhetoric that has been labelled racist into his re-election fight.
-Mexican border. Omar, along with the three others Trump denigrated - Alexandria Ocasio-Cortez of New York, Ayana Pressley of MA and Rashida Tlaib of MI - wanted more compassionate control over government actions, and they voted against most Democrats.
Omar's comity with her Democratic colleagues, however, could be short-lived.
But a competing resolution condemning the BDS movement has wide support in the House and is much more likely to win approval, if any resolution passes.