Story highlights Trump says Rubio supports "amnesty" because he is Hispanic

Despite evidence, Trump says undocumented immigrants cost U.S. up to $300 billion annually

"Do you really believe they pay taxes?" Trump asks CNN's Erin Burnett

(CNN) Donald Trump said on Thursday that Marco Rubio favors "amnesty" for undocumented immigrants because the Florida senator and his parents are Hispanic.

"That's why he wants amnesty," Trump told Erin Burnett during an interview on "Erin Burnett OutFront."

The billionaire repeatedly pointed to Rubio's efforts in support of a 2013 bipartisan immigration reform bill, which passed the Senate but stalled in the House, as evidence against his Republican primary rival.

"He was always in favor of amnesty, he was always in favor of letting people pour into the country," Trump said, "then what happened is, when people found that out, he sank like a rock in the water."

Trump also suggested that no more than 10% of the 11 million undocumented immigrants living in the country pay taxes.

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