Former President Donald J. Trump filed a defamation lawsuit against ABC News on Monday, arguing that the anchor George Stephanopoulos had harmed his reputation by saying multiple times on-air that Mr. Trump had been found liable for raping the writer E. Jean Carroll.A jury in a Manhattan civil case last year found Mr. Trump liable for sexually abusing and defaming Ms. Carroll, but did not find the former president liable for rape. The judge, however, later clarified that because of New York’s narrow legal definition of “rape,” the jury’s finding did not mean that Ms. Carroll…