Democratic presidential nominee Hillary Clinton's lead over Republican Donald Trump is dropping even as questions grow over her use of a personal email server while serving as Secretary of State.

Clinton's chances of winning the White House are just slightly more than 77 percent, according to forecasting site FiveThirtyEight.com, which gives Trump a 23 percent chance of victory in the Nov. 8 General Election if it were held today.

While Clinton's percentage remains high, it reflect a substantial drop from just two weeks ago when the Democratic nominee's chances of defeating Trump grew to more than 90 percent.

Comey letter rocks race

Clinton's campaign was hit with a substantial blow Friday when FBI Director James Comey sent a letter to lawmakers advising them the agency was investigating "emails that appear to be pertinent" to the investigation of Clinton's use a personal email server. In July, Comey announced the FBI would not recommend charges against Clinton for using the email server, a move that drew the ire of Republicans.

Comey said the new emails were uncovered "in connection with an unrelated case." Multiple media reports have linked the emails devices used by Huma Abedin, a senior Clinton aide, and her estranged husband, former Congressman Anthony Weiner. Weiner is currently under investigation for sexting with a 15-year-old girl.

On Saturday, Clinton criticized Comey's handling of the latest revelations.

"It's pretty strange to put something like that out with such little information right before an election," Clinton said during a Florida rally Saturday. "In fact, it's not just strange, it's unprecedented and it is deeply troubling."

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What the polls show...

RealClearPolitics average of major polls has Clinton up by 4.6 points over Trump - 47.1 percent to 42.5 percent. On Oct. 18, Clinton 's lead was almost 8 points.

There are more troubling numbers for the Clinton camp.

The most recent ABC News/Washington Post poll shows a growing number of Republicans are saying they will go to the polls to back their party's nominees. Earlier in October, 75 percent of people who said they were Republican were planning on going to the polls. In less than a week, that number grew to 81 percent.

The poll shows 86 percent of Republicans are now planning on supporting Trump, up from 82 percent earlier this week. More significantly, Trump has also gone from a 6 point deficit to a 16 point advantage with independent voters.

Clinton hurt at the polls?

It's too soon to see the full effect the latest email scandal could have on Clinton's campaign but Trump was already making up ground in recent days. Trump's numbers had dropped precipitously in early October after he was hit with a wave of claims that he sexually abused women.

Earlier this month, Clinton held the lead in 14 key states, including North Carolina, Nevada and Florida. The former Secretary of State still leads in each state though her margin of victory has dropped to less than 2 points in each state. Trump has taken back the lead in Arizona, Iowa, Ohio and Georgia.