A new trove of emails that appear pertinent to the now-closed investigation into Hillary Clinton’s private email server was discovered after the F.B.I. seized at least one electronic device shared by Anthony D. Weiner and his estranged wife, Huma Abedin, a top aide to Mrs. Clinton, federal law enforcement officials said Friday.

The F.B.I. is investigating illicit text messages that Mr. Weiner, a former Democratic congressman from New York, sent to a 15-year-old girl in North Carolina. The bureau told Congress on Friday that it had uncovered new emails related to the Clinton case — one federal official said they numbered in the tens of thousands — potentially reigniting an issue that has weighed on the presidential campaign and offering a lifeline to Donald J. Trump less than two weeks before the election. READ MORE