Rep. Adam SchiffAdam Bennett SchiffThe Hill's Morning Report — Sponsored by United Against Nuclear Iran — Kavanaugh and his accuser will testify publicly Russia probe accelerates political prospects for House Intel Dems Trump to declassify controversial text messages, documents related to Russia probe MORE (D-Calif.) said Sunday that FBI Director James Comey's email to lawmakers regarding the Hillary ClintonHillary Diane Rodham ClintonHillicon Valley: Trump's exclusive interview with Hill.TV | Trump, intel officials clash over Russia docs | EU investigating Amazon | Military gets new cyber authority | Flynn sentencing sparks new questions about Mueller probe READ: President Trump’s exclusive interview with Hill.TV Keeping up with Michael Avenatti 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.