Donald Trump Jr. blasts Beto O’Rourke: ‘Irish guy pretending to be Hispanic’

Donald Trump Jr.Donald (Don) John TrumpTrump store sells more than 140,000 plastic straws in dig at 'liberal paper straws' Trump Jr., Guilfoyle raise .5 million on California swing for Trump campaign Trump Jr.'s book, 'Triggered,' to be published in November MORE slammed Rep. Beto O'RourkeBeto O'RourkeO'Rourke calls Trump event 'almost an impromptu Nuremberg rally' after 'send her back' chants Biden's lead narrows in early voting states: poll New CBS poll shows Biden with 7-point lead in New Hampshire MORE (D-Texas) on Monday, saying the Democratic challenger to Sen. Ted CruzRafael (Ted) Edward CruzTed Cruz: 'Fox News went all in for Trump' 2 Republican senators introduce resolution to label antifa as domestic terrorists Ted Cruz: Trump's chances of winning reelection are '50-50' MORE (R-Texas) is "pretending" to be Latino.

"What’s authentic about an Irish guy pretending to be Hispanic? Asking for some friends Texas," Trump Jr. tweeted, linking to an article from ABC News that contended O'Rourke has kept the Senate race close partly because of a desire among Democratic voters to see authenticity in candidates.

O'Rourke, whose full first name is Robert, has been mocked by some on the right for his decision to go by Beto, a name that some conservatives say he chose because it sounds Hispanic.

O'Rourke has said it's a childhood nickname that stuck.

Cruz ran an ad earlier this year mocking O'Rourke's nickname.

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"If you are going to run in Texas, you can’t be a liberal man. I remember reading stories, liberal Robert wanted to fit in," the ad says. "So he changed his name to Beto and hid it with a grin."

Cruz's full name is Rafael Edward Cruz.

When asked earlier this year about his own name change, Cruz told CNN about his Cuban heritage

"You're absolutely right. My name is Rafael Edward Cruz," he said. "I am the son of my father Rafael Cruz, an immigrant from Cuba who came to Texas with nothing."

Cruz leads O'Rourke by about 7 points, according to a RealClearPolitics average of polls, just weeks before the Nov. 6 midterm elections.