Donald Trump says the reason Sen. Bernie Sanders refuses to concede to presumptive Democratic nominee Hillary Clinton because he wants to see if the FBI will indict her.

"One thing about Bernie, he doesn't give up," Trump said at a rally Saturday in Las Vegas.

"He's crazy as a bedbug, but he doesn't quit," the GOP's presumptive nominee said. "And I think Bernie should continue to go forward, folks."

"He's waiting for the FBI to do what everybody thinks they're going to do," Trump quipped to a cheering crowd, responding to reports that the FBI is investigating Clinton for her use of a private email server when she was secretary of state.

Trump said Sanders is "sort of saying: 'Look. Let's hang in there because ultimately it's called the FBI convention, and then we will be the only people, and we will have done something like Trump did. I want to be like Trump.'"

Trump said, "We'll see."

Trump suggested Clinton is getting special treatment despite the egregious nature of her actions.

"Every person that we know of that has done far less than what she has done, their lives have been destroyed," he said.

"And the press doesn't cover it because the press is so one-sided," he continued. "CNN, as an example. It's called the Clinton News Network," Trump said. "Its a joke."