The FBI said Friday it is reviewing newly discovered emails related to Hillary Clinton's use of a private email server to determine whether she properly handled classified emails. The reopening of the investigation comes after the FBI recently "learned of the existence of emails that appear to be pertinent to the Clinton investigation," FBI director James Comey said. Comey added, however, that "FBI cannot yet assess whether or not this material may be significant." It is also unclear "how long it will take us to complete this additional work." FBI's announcement today is "certain" to become an issue in the final two weeks of the presidential campaign, however. Donald Trump is naturally pleased hearing the news, at New Hampshire, Trump said the new probe offered the FBI the chance to correct a "grave miscarriage of justice." He added, "We must not let her take her criminal scheme into the Oval Office." Supporters responded with chants of "Lock her up!" Trump added that the email investigation is "bigger than Watergate."