FBI Director James Comey is coming under fire for his terse announcement on Friday that in light of new information, his agency is reviewing its findings from the investigation into Democratic presidential nominee Hillary Clinton's use of a private email server during her time as Secretary of State.

TheHill.com said that to many observers, Comey's statement "appeared too vague for an announcement sure to shake up the presidential race with less than two weeks until Election Day, critics on both sides of the aisle claimed."

John Weaver -- an aide to Ohio's Republican Gov. John Kasich -- wrote on Twitter, "Director Comey should give a more complete explanation. Is this reviewing newly found emails? Is this reopening? Too much at stake."

Sen. John Cornyn (R-TX) asked why Comey would chose this tense and divided time to make such a potentially provocative announcement.

"Why is FBI doing this just 11 days before the election?" Cornyn demanded to know.

New York Times columnist and Clinton supporter Paul Krugman blasted Comey for making a "partisan intervention" in the electoral process.

NBC News reporter Tom Winter said that there are 3 emails under review and that none of them were previously withheld from investigators by Clinton or her campaign.

"NEW: NBC's Pete Williams reports that the e-mails Comey announced today were NOT originally withheld by Clinton or campaign," he said.