O'Rourke declined to comment on the fact that Cruz goes by "Ted", instead of his given name of Rafael Edward Cruz.
U.S. Sen. Ted Cruz, R-Texas, and U.S. Rep. Beto O'Rourke have clinched their party's nominations and will face off in the general election in November, according to The Associated Press.
The ad says O'Rourke "wants to take our guns" and calls him "liberal Robert", referring to his given first name.
Cruz said in the interview Wednesday that "some of it is just to have a sense of humor". "I am the son of my father Raphael Cruz, an immigrant from Cuba who came to Texas with nothing".
O'Rourke said he has gone by "Beto" since he was born, CNN reported.
While Democratic primary turnout surged past 1 million on Tuesday, it was still well short of the more than 1.5 million people who voted in the Republican primary.
Cruz emerged as a victor in the Tepublican polls Tuesday, leading his closest GOP challenger by an 80-percent margin. "This is one way for Cruz to indirectly signal that he's not".
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