US Democratic presidential nominee Hillary Clinton’s unpopularity among American voters has reached a new high, according to a new poll, putting her on par with her Republican rival Donald Trump.

The latest findings by the ABC News/Washington Post Tracking Poll, released on Monday, show that 59 percent of registered voters have an unfavorable view of Clinton, and an identical percentage of voters dislike Trump.

In addition, nearly half of registered voters, 47 percent exactly, have a "strongly unfavorable" impression of both presidential candidates.

The former first lady’s growing unpopularity follows renewed focus on her use of a private email server while she served as secretary of state from 2009 to 2013.

Washington Post-ABC News polling (Source: The Washington Post)

On Friday, just days ahead of the November 8 election, FBI Director James Comey dropped a bombshell on the Clinton campaign by announcing the revival of an investigation into thousands of new emails sent by Clinton as secretary of state.

The bureau is set to examine roughly 650,000 emails recovered from a laptop belonging to Anthony Weiner, a former US congressman who was married to Clinton’s top aide, Huma Abedin, until their divorce in late August.

Clinton and other Democrats are very upset at the FBI chief’s move. Senate Minority Leader Harry Reid, a Democrat from Nevada, wrote a letter to Comey on Sunday, saying his decision would favor the Republican Party and may change the outcome of the election.

Clinton losing support to Trump among millennials

Donald Trump yells to supporters during a campaign rally at the Venetian Hotel on October 30, 2016 in Las Vegas, Nevada. (Photo by AFP)

According to a new USA Today poll, released on Monday, Clinton’s massive lead over Trump among millennials -- aged between 18 and 34 – has narrowed as the presidential race is set to enter the final week.

In the last two weeks, Clinton’s lead among millennials has shrunk by six percentage points, from 68 percent to 62 percent.

Meanwhile, Trump reduced Clinton’s 12-point lead from last week to only one percentage point, trailing her 45 percent to 46 percent, according to the ABC News/Washington Post tracking poll released on Sunday.