(CNN)Hillary Clinton's campaign sent cease-and-desist letters to broadcasters advising that they shouldn't air ads from pro-Donald Trump PACs that include the claim that Clinton is "under investigation by the FBI." The letters were dated Sunday, the same day the FBI announced that it was sticking by its conclusion that no charges were recommended against Clinton following completion of a review of recently discovered emails belonging to Clinton aide Huma Abedin. "These ads falsely claim Secretary Clinton is under investigation by the FBI," said the letter from Marc Elias, general counsel for the Clinton campaign. A copy of the letter was...