Donald Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE told a huge crowd Friday night that Hillary Clinton Hillary Diane Rodham ClintonJoe Biden looks to expand election battleground into Trump country Biden leads Trump by 12 points among Catholic voters: poll The Hill's Campaign Report: Biden goes on offense MORE is so heavily protected by the Justice Department that she wouldn't be punished for shooting someone with thousands of witnesses.

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As attendees at Trump's event in Pensacola, Fla., chanted "lock her up," a familiar refrain at Trump rallies, the GOP nominee argued that getting out of prosecution was the "single greatest achievement of Hillary Clinton."

"We're going to do better than lock her up, we're going to win on Nov. 8," Trump said.

"Because she's being so protected, she could walk into this arena right now and shoot someone with 20,000 people watching, right smack in the middle of the heart, and she wouldn't be prosecuted. OK? That's what's happened. That's what's happened to our country."

The Justice Department declined to indict Clinton after an investigation into her use of a private email server as secretary of State.