Republican presidential nominee Donald TrumpDonald TrumpStowaway found in landing gear of plane after flight from Guatemala to Miami Kushner looking to Middle East for investors in new firm: report GOP eyes booting Democrats from seats if House flips MORE's campaign manager said Sunday that the FBI's probe into Hillary ClintonHillary Diane Rodham ClintonRepublicans seem set to win the midterms — unless they defeat themselves Poll: Democracy is under attack, and more violence may be the future Popping the progressive bubble MORE's emails plays into the "reluctance" voters feel about supporting the Democratic nominee.

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"This plays right into their reluctance about Hillary Clinton anyway," Kellyanne Conway said on ABC's "This Week."

Conway cited a new ABC News/Washington Post poll that found approximately a third of likely voters are less likely to support the former secretary of State for president following the FBI's announcement.

FBI Director James Comey sent a letter to lawmakers Friday alerting them that emails potentially relevant to Clinton's server investigation were discovered in a separate investigation.

The New York Times later reported that the the separate investigation was into former Rep. Anthony Weiner (D-N.Y.).