Rep. Adam SchiffAdam Bennett SchiffSchiff: Surveillance warrant docs show that Nunes memo 'misrepresented and distorted these applications' Sunday shows preview: Questions linger over Trump-Putin summit Obama, Bush veterans dismiss Trump-Putin interpreter subpoena MORE (D-Calif.) said Sunday that FBI Director James Comey's email to lawmakers regarding the Hillary ClintonHillary Diane Rodham ClintonWhite House protests extend into sixth day despite rain Clinton: US is 'losing friends and allies' under Trump Justice Dept releases surveillance applications for former Trump aide MORE email server investigation was "a terrible error in judgment."

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"I think this was a terrible error in judgment by the director, to release this kind of ambiguous letter. These may be pertinent; they may be significant; they may not be significant. They may not be pertinent," Schiff, the ranking member of the House Intelligence Committee, told ABC's "This Week."

On Friday, Comey sent a letter to Congress alerting lawmakers to the fact that the FBI discovered emails that may be relevant to the Democratic presidential nominee's server investigation.

It was later reported that the separate investigation was into former Rep. Anthony Weiner (D-N.Y.). Weiner is the husband of longtime Clinton aide Huma Abedin.

"That kind of an ambiguity bomb this close to an election was a terrible lapse in judgment," Schiff added.