Democratic presidential nominee former Secretary of State Hillary Clinton listens to a question during the town hall debate at Washington University on October 9, 2016 in St Louis, Missouri.

There may be no immediate end in sight to Hillary Clinton's new email troubles.

The Wall Street Journal reported Sunday afternoon that federal agents are getting ready to parse through roughly 650,000 emails from former Democratic Congressman Anthony Weiner's laptop.

Officials are trying to determine how many relate to the Democratic presidential nominee's previous investigation into her private server while serving as Secretary of State, according to The Journal, which cited people familiar with the matter. CBS News reported late Sunday that FBI officials had obtained a warrant for the electronic missives.

Weiner did not immediately respond to CNBC's request for comment, but the Clinton campaign wasted little time in blasting the new report.

The former Secretary of State and her surrogates have been in damage control mode since news first leaked on Friday, and have launched a coordinated campaign demanding more information from federal officials—who themselves have been vague about what they know.

Brian Fallon, Clinton's press secretary, said in a tweet linking to the WSJ story that the FBI's probe was "shameless and misleading."

TWEET: "May" be tied. These are misleading leaks from the FBI and it is shameless.

The Federal Bureau of Investigation announced Friday it was looking into newly uncovered emails related to its investigation of Clinton, leading Clinton supporters to criticize the FBI and giving new life to Republican nominee Donald Trump's campaign, which had been floundering recently.

The news also took the air out of the U.S. stock market, with the three major U.S. indexes unable to regain previous gains at Friday's close.

Click here for the full Wall Street Journal story.