#IStandWithPresTrump trends in response to #IStandWithIlhan

Dueling hashtags tweeted by supporters of Rep. Ilhan OmarIlhan OmarTlaib says Trump 'scared' of 'Squad' Trump to return to North Carolina to stump for special election candidate Former GOP Rep. Jason Lewis says he'll challenge Tina Smith in Minnesota MORE (D-Minn.) and President TrumpDonald John TrumpGraham: America must 'accept the pain that comes in standing up to China' Weld 'thrilled' more Republicans are challenging Trump New data challenges Trump's economic narrative MORE trended on Twitter Thursday morning, hours after the crowd at Trump's rally in North Carolina broke into chants of "send her back" aimed at the freshman congresswoman.

#IStandWithIlhan led the United States trending topics list Wednesday night and Thursday morning after Twitter users reacted to the chants aimed at Omar, a Muslim woman who came to the U.S. as a refugee from Somalia when she was a child. Trump targeted Omar with fierce criticism at his rally and had previously tweeted that the congresswoman and three progressive minority colleagues should "go back" to the "crime infested" places they came from.

But #IStandWithIlhan was challenged Thursday morning by the hashtag #IStandWithPresTrump. 

The trend was boosted by some prominent supporters of Trump including conservative activist Candace Owens and Infowars host Paul Joseph Watson.

A majority of tweets under the hashtag, however, appeared to be mocking Trump supporters, with some Twitter users posting images of Ku Klux Klan members as a way of calling them racists.

#SendHerBack also trended briefly Thursday morning, largely buoyed by Trump's critics such as conservative host Hugh Hewitt, who called his attack "nativist." 

The president and Omar, along with three other freshman lawmakers, have dueled over social media and in public statements for days following Trump's tweets earlier this week urging the four to "go back" to their home "countries," despite Omar being the only of the four to have been born abroad.

The House voted Tuesday to formally condemn Trump over the comments, which Speaker Nancy PelosiNancy Pelosi11 Essential reads you missed this week Pelosi asks Democrats for 'leverage' on impeachment Is there internet life after thirty? MORE (D-Calif.) called "racist."

Updated at 10:48 a.m.