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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.

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