MIAMI (AP) — The FBI is investigating whether a little-known Democratic congressional candidate improperly received thousands of dollars for campaign mailings from Republican U.S. Rep. David Rivera, a senior law enforcement official said Thursday.

At least one of the mailings from Justin Sternad’s campaign was critical of the eventual Democratic nominee, Joe Garcia, who has previously tried to unseat Rivera in Florida’s 25th congressional district that stretches from suburban Miami to Key West.

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