Hillary Clinton
Hillary Clinton Reuters

Democratic presidential candidate Hillary Clinton on Monday challenged the FBI's new email inquiry, The Associated Press reported.

"There's no case here," she declared during a campaign rally in Ohio, accusing the FBI of having jumped into the election "with no evidence of any wrongdoing with just days to go."

Clinton added that if the bureau wants to look at the emails from her longtime aide Huma Abedin, "by all means, they should look at them."

But she insisted the FBI would reach the same conclusion it did earlier this year when it declined to prosecute Clinton and her advisers for their handling of classified information.

"They said it wasn't even a close call," she said, according to AP. "I think most people have decided a long time ago what they think about all of this."

FBI Director James Comey dropped a bombshell last Friday when he announced his office was pursuing potential new evidence related to Clinton’s use of a private email server as secretary of state.

The latest emails under investigation are related to a separate probe of former congressman Anthony Weiner, who is alleged to have exchanged explicit sexual messages with a 15-year-old girl.

Weiner is the estranged husband of Abedin.

Clinton’s rival, Republican presidential candidate Donald Trump, has warned against Clinton's trustworthiness following the renewed FBI probe and has also lauded the agency for reopening the probe and fixing its “historical mistake”.

Clinton, meanwhile, tried to refocus the contest on Trump on Monday as she opened the final full week of campaigning with a rally at Kent State University.

Speaking in serious tones, Clinton warned at length about putting Trump in control of the nation's nuclear stockpiles. She accused him of talking "casually" about nuclear war and wondered whether he knows "that a single nuclear warhead can kill millions of people."

Several polls released recently have shown Clinton sliding, even before news of the renewed FBI probe.

One poll has even shown Trump pulling ahead of Clinton.