Hillary Clinton is currently leading in the Democratic presidential race, but that does not mean the road to becoming the Democratic presidential nominee is a shoo-in. One issue that has repeatedly weighed down her campaign is her use of a private email server during her tenure as Secretary of State.

Clinton’s use of a private email server is the target of an ongoing FBI investigation, and it poses a threat to her political aspirations. In fact, Judge Andrew Napolitano said the agency has solid evidence to indict and convict her.

Napolitano said on The O’Reilly Factor that the “FBI knows a lot more about it than I do.” He said the “evidence of her guilt is overwhelming.”

The judge predicted that if the Justice Department protects Clinton from an indictment, Clinton’s candidacy will suffer and President Barrack Obama will have to face a crisis similar to one that former President Richard Nixon had experienced.

Judge Napolitano Explains Possible Indictment of Hillary Clinton

“If the Democrats that run the Justice Department decide that she’s not going to be indicted because she’s about to become or will have become the Democratic nominee for president, can you imagine what the reaction will be? The FBI will release the evidence against her, much of which is already publicly known,” warns the judge on Judge Napolitano’s Chambers.

Napolitano further said he thinks FBI director James Comey will step down from his position and Obama will be confronted “with a crisis not unlike Richard Nixon’s during the so-called ‘Saturday Night Massacre’ in Watergate where people resigned rather than doing what the President asked them to do.”

Ultimately, this will have a “catastrophic effect” on Clinton’s candidacy, said Napolitano.

“Probably so catastrophic that she will be replaced on the Democratic ticket,” he predicted.

However, the problem is not only whether there is enough evidence to charge her for using a private server, which risked the nation’s security. Napolitano echoes the same doubts as other critics. An indictment will be impossible without the backing of the Attorney General and the White House.

Judge Napolitano: DOJ Shielding Hillary From Indictment Will Be ‘Catastrophic’ For Her https://t.co/2r1tghomvj pic.twitter.com/EFN5Rvmmxc — The Daily Caller (@DailyCaller) April 26, 2016

Another problem Democrats are facing is Clinton’s indictment after becoming the Democratic presidential nominee. It is unknown whether the result of the investigation will be released before a Democratic presidential nominee is determined.

“Somebody asked me if the Democratic National Convention is a hard stop or a key date for you? Are you doing this aimed at that? And I said, no,” FBI director Comey told NBC News on Thursday.

Comey added that they aim to do the investigations that are of great interest to the public “well and promptly.” He said that he is paying close attention to the investigation because he wants to make sure they have “the resources, the people, the technology, and the space to do those things, and to do it in the way I hope we do all our work, which is competently, honestly, and independently.” Moreover, Comey is confident that the investigation is being done in that manner.

FBI Director James Comey says there’s no rush on Hillary Clinton’s email probe https://t.co/NJmzdPa055 pic.twitter.com/KB40SrC2p5 — CNN Politics (@CNNPolitics) April 6, 2016

Is it possible for Hillary Clinton to get indicted after the Democratic National Convention? Iowa Senator Chuck Grassley believes there is going to be political interference from the FBI.

“Is there going to be political interference? If there’s enough evidence to prosecute, will there be political interference?” Grassley reportedly asked at a meeting with Des Moines Rotarians on Friday. “And if there’s political interference, then I assume that somebody in the FBI is going to leak these reports and it’s either going to have an effect politically or it’s going to lead to prosecution if there’s enough evidence.”

Sen. Chuck Grassley thinks FBI may leak Hillary Clinton private email investigation pic.twitter.com/Ut0PAnGO6X — FOX Business (@FoxBusiness) April 25, 2016

Despite the ongoing investigation, Hillary Clinton continues to lead polls, and her chances still look promising. Would an indictment change the voters’ minds?

[Photo by Matt Rourke/AP Images]