The FBI obtained a warrant to search emails related to the Hillary Clinton private server probe that were discovered on ex-congressman Anthony Weiner's laptop, law enforcement officials confirmed to NBC News on Sunday.
The warrant came two days after FBI director James Comey revealed that the emails were linked to Weiner's estranged wife, top Clinton aide Huma Abedin.
The FBI already had a warrant to search Weiner's laptop, but that only applied to evidence of his allegedly illicit communications with an underage girl.
Comey's disclosure of the emails ignited fierce criticism, particularly from Clinton, who called the move an "unprecedented" departure from FBI policy.
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Democratic Senate Minority Leader Harry Reid meanwhile accused Comey of a "disturbing double standard" and said Comey may have violated the Hatch Act.
The FBI did not immediately respond to requests for comment.