 ABC Chief Washington Correspondent Jonathan Karl. Donald Trump will accept the Republican Party's nomination for president for a third time tonight. More investigation into the attempted assassination on Saturday in Pennsylvania and more calls for the head of the Secret Service, Kim Cheadle, to resign because of the security lapses. In Russia, Wall Street Journal reporter Evan Gershkovich attending day two of his closed-door trial on espionage charges, which he strongly denies. This is ABC News.