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Donald Trump called in to "On The Record" tonight to weigh in on a variety of topics, including his feud with fellow Republican presidential contender Ted Cruz.

Trump explained to Greta Van Susteren that he was waiting for Cruz to attack before he fired back.

"Now he's attacked, so I've attacked him very strongly and vociferously," Trump said, adding that he believes the Texas senator is having a hard time with his dropping poll numbers, in addition to questions about his validity as a candidate.

"He was a Canadian citizen until 14 or 15 months ago," Trump said. "He was a United States senator, and he was a Canadian citizen."

Trump said Cruz's claim that he wasn't aware of his dual citizenship is simply not believable, and it stains his record.

He added that Cruz's failure to report loans from CitiBank and Goldman Sachs during his 2012 Senate race is also a big problem.

"He wants to pretend he’s Robin Hood with everybody and he's this honorable guy fighting the banks," Trump said. "He didn't want the voters to see that he's borrowing money and personally guaranteeing it from banks."

Trump declared that Cruz's undisclosed loans are "probably illegal" and "certainly wrong."

Watch more above.

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