Republican Donald Trump on Sunday promised to appoint a special prosecutor to reopen the investigation into Hillary Clinton’s use of a private email server as secretary of state.

“I hate to say it, but if I win, I am going to instruct my attorney general to get a special prosecutor to look into your situation, because there has never been so many lies, so much deception,” Trump said at the second presidential debate. “There has never been so much deception. And we are going to have a special prosecutor.”

“People have been, their lives have been destroyed for doing one-fifth of what you’ve done. And it’s a disgrace. And honestly, you ought to be ashamed of yourself.”

It might be the first time in an American presidential election that one candidate threatened to open an investigation that could end with putting his opponent in prison. Clinton alternated between a smile and a look of bemusement. Trump said people he talks to on the campaign trail and professional investigators at the FBI are furious.

“You get a subpoena, and after getting a subpoena, you delete 33,000 emails and then you acid-wash them, or bleach them as you would say,” he said. “People have been, their lives have been destroyed for doing one-fifth of what you’ve done. And it’s a disgrace. And honestly, you ought to be ashamed of yourself.”

Clinton insisted that everything Trump said was completely false and invited Americans to log onto her website to see “fact checks” of his debate statements.

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“It’s just good that someone with the temperament of Donald Trump is not in charge of the laws in our country,” she said.

Without missing a beat, Trump interjected, “Because you’d be in jail.”

An investigation into Clinton’s use of a private server as secretary of state to bypass the official government system ended when FBI Director James Comey recommended not pursuing criminal charges, despite findings of agents that Clinton has used the non-secure system for emails that contained classified information. The FBI has said 110 emails contained classified information, including eight with data marked “top secret.”

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Authorities have said the destruction of emails after a congressional subpoena were the work of a private contractor and that there was no evidence the Clinton ordered those emails to be deleted.

Clinton said her use of a private email server was a mistake but insisted, “I take classified information very seriously.”

Clinton is no secret to special prosecutors. Kenneth Starr and his successors spent years investigating Bill and Hillary Clinton’s involvement in a questionable land deal. That led to revelations that Bill Clinton had a White House affair with intern Monica Lewinsky.