The surprise Friday letter on Hillary Clinton's email investigation from FBI Director James Comey, which landed on the race for President like a meteor, was still burning brightly on Saturday, as Donald Trump used it to bolster attacks against Clinton, while Democrats bitterly denounced the motives of the FBI chief.

"This is the biggest political scandal since Watergate," Trump said at a rally in Golden, Colorado on Saturday, as he continued to argue that Clinton should have been hit with criminal charges already for mishandling classified material from her time as Secretary of State.

"Hillary has nobody to blame but herself," Trump added.

As for Clinton, she brought up the issue while on the campaign trail in Florida, telling supporters at a rally in Daytona Beach that it was time for the FBI to get everything out to the public - as the crowd booed loudly when she mentioned FBI Director James Comey's letter.

These type of headlines were not what Democrats had been dreaming of a few days ago, as it gave Republicans the chance to hammer on her ethics, and her decision to use a private email server while Secretary of State.

"If you're like me, you probably have a few questions," Clinton said, with an animated and puzzled look on her face, as she labeled the FBI move "deeply troubling."

While Republicans attacked, Democrats in Congress rallied to Clinton's side.

"Comey FBI letter is shocking interference with US democracy," said Rep. Lois Frankel (D-FL) on Twitter.

Making the story even more interesting was the Justice Department letting reporters know that officials had told the FBI chief *not* to release that letter - but he went ahead and did it anyway.

It still wasn't clear on Saturday whether the emails - first in the possession of Clinton aide Huma Abedin, and now her estranged husband, ex-Rep. Anthony Weiner (D-NY) - even had any direct relevance to the Clinton email investigation.

"Just ten days before a presidential election, the American people deserve more disclosure," said four Democratic Senators, who sent a letter to the FBI Director and Attorney General, demanding answers in a few days.

Look for Trump to amplify his message on Sunday when he makes stops in Nevada, Colorado and New Mexico.