The FBI has obtained a warrant to begin reviewing newly discovered emails that may be relevant to the Hillary Clinton email server investigation, a law enforcement official has told The Associated Press.

FBI investigators want to review emails of longtime Clinton aide Huma Abedin that were found on a device seized during an unrelated sexting investigation of Anthony Weiner, a former New York congressman and Abedin's estranged husband.

The Clinton email inquiry, which closed without charges in July, resurfaced on Friday when FBI Director James Comey alerted members of Congress to the existence of emails that he said could be pertinent to that investigation.

Separately Sunday, another law enforcement official said FBI investigators in the Weiner sexting probe knew for weeks about the existence of the emails potentially related to the probe of Clinton's server. A third law enforcement official also said the FBI was aware for a period of time about the emails before Comey was briefed, but wasn't more specific.

Trump also highlighted reports that the Justice Department had discouraged the FBI from alerting Congress to the unexpected discovery of the emails, and said the department is trying "so hard" to protect Clinton.

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