Donald Trump brought more devastating news about Hillary Clinton to Florida on Thursday, telling a screaming crowd in Jacksonville – just five days before the election – that his Democratic rival is teetering on the brink of a perp walk

'It was reported last night that the FBI is conducting a criminal investigation into Hillary Clinton's pay-for-play corruption during her tenure as secretary of state,' he said, referring to news that federal investigators have been probing the Bill, Hillary and Chelsea Clinton Foundation since before the presidential primary season began.

'The FBI is investigating how Hillary Clinton put the office of secretary of state up for sale in violation of federal law. The investigation is described as "a high priority." It's far-reaching and has been going on for more than one year,' Trump said.

'It was reported that an "avalanche" of information is coming in. The FBI agents say their investigation is likely to yield an indictment.'

Donald Trump's closing argument in Florida on Thursday included news about Hillary Clinton's slide into criminal jeopardy as the FBI is now running twin criminal investigations involving her conduct while she was secretary of state

Hillary Clinton, Trump claims, ran a corrupt scheme to sell State Department access in exchange for donations to her family foundation and speaking fees for her husband, former President Bill Clinton

After the now-familiar chant of 'Lock her up!' subsided, Trump warned that corruption in the Obama administration might allow Clinton to skate.

'The system is rigged. Just remember that,' he said.

'Reports also show the political leadership at the Department of Justice is trying to protect Hilary Clinton, and is interfering with the FBI's criminal investigation.'

Trump also relayed news that 'the laptops of Clinton's top aides, which had been slated for destruction, were not in fact destroyed ... and that the FBI has been successfully using them to gather information for their criminal investigation.'

'Good job by the FBI!' he said, offering rare praise for the bureau.

'Finally,' he concluded, 'it is believed that no less than five foreign intelligence agencies successfully hacked into Clinton's illegal, insecure server, which contained classified information, creating an ongoing security threat to the United States.'

Trump has long contended that Clinton set up a homebrew email server in her Chappaqua, New York basement in early 2009 to shield graft in her State Department.

Clinton, he has claimed, gave undue influence to foreign nations and companies that donated to the Clinton Foundation and showered her husband with six-figure speaking fees.

Trump is in deal-closing mode this week with just a few days left until the election

The Republican nominee said Hillary Clinton is 'probably the most dishonest person ever to run for the office of president. I really believe it'

The server, however, housed thousands of emails shown to contain classified information. Clinton insisted that she was unaware of the information's classification status.

She agreed in writing when she took office, however, that she would be responsible for maintaining the security of state secrets in her possession. And President Barack Obama designated her as one of just 20 federal officials empowered to declare information classified.

The Democratic nominee, he said Thursday, is 'probably the most dishonest person ever to run for the office of president. I really believe it.'

'Hillary Clinton has engaged in a massive, far-reaching criminal conduct, and equally far-reaching cover-up,' he said.

'She created an illegal email server to shield and guard her activity. ... She illegally transmitted confidential information and then lied about it to Congress. She illegally destroyed federal records including 33,000 emails after receiving a congressional subpoena, and she made 13 phones disappear, some with a hammer,'

'Who in this room has gotten rid of a phone and then smashed the hell out of it with a hammer?' he asked, half tongue-in-cheek. 'Raise your hand. Raise your hand! I see one hand over there.'

'What business are you in sir?' he asked a man in the crowd.

'No, I don't want to know.'

Clinton is pulling out all the stops in her final days of campaigning, appearing alongside President Obama and speaking to the large crowds that follow him

'She engaged in corrupt pay-for-play at the State Department for personal enrichment. She lied to the FBI and she lied to the American people many, many times,' he said.

The Republican predicted 'an unprecedented constitutional crisis' if Clinton is elected, with the sitting president under investigation by a Justice Department she manages.

Trump has been in deal-closing mode through a four-city Florida swing that began Wednesday morning. In Jacksonville he cited swing-state polls that show him building momentum, and a national poll that shows he has overtaken Clinton overall.

'Just out, a few minutes ago, the new Rasmussen poll has us 3 up right now, 3 up nationwide,' he said as cheers rang through a rodeo arena in Jacksonville.

'We're leading in Florida, we're leading in Ohio, we're leading in Iowa, I think we're leading in North Carolina, which is big. Doing well in Pennsylvania right there, but we are leading all over.'

I tell you what, we're going to have something that's going to be very special. Get out there on Tuesday. Don't fail.