Donald Trump said fellow GOP rivals don't have "the guts to even talk about" immigration and its effect on crime, punching back at other candidates such as Sen. Marco Rubio who have denounced his contentious comments on immigration.

Trump pointed to a San Francisco tourist allegedly shot by an illegal immigrant as evidence that his comments that Mexicans are bringing crime, drugs and rapists across the border was spot on.

"Our Southern border is unsecure. I am the only one that can fix it, nobody else has the guts to even talk about it," Trump said on Twitter.

He was referring to the shooting death of Kathryn Steinle, a tourist who was allegedly shot by an illegal immigrant who was allegedly deported five times.

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