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

Donald Trump Jr.Donald (Don) John TrumpTrump Jr.'s India trip cost taxpayers nearly 0K: report Social media explodes over Avenatti arrest Mueller targets Stone in final push MORE slammed Rep. Beto O'RourkeRobert (Beto) Francis O'RourkeEntrepreneur touts big solutions, endorsements in discussing presidential bid Dem pollster: Texas, Georgia diversifying because they are 'centers for opportunity' Cruz brushes off question about campaign claim on O'Rourke paying for caravan MORE (D-Texas) on Monday, saying the Democratic challenger to Sen. Ted CruzRafael (Ted) Edward CruzDemocratic strategist warns Beto should be ‘careful’ with social media presence Hillary advisers battle over whether she’ll run in 2020 O'Rourke writes blog post describing a literal run from near the capitol to near the White House 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.