By Jonathan Landay WASHINGTON (Reuters) – A binder holding top-secret intelligence that contributed to a U.S. assessment that Russia tried to help throw the 2016 U.S. election to Donald Trump has been missing since the last days of his presidency, a source familiar with the issue said. The Russia intelligence was included with other documents in a binder that Trump directed the CIA to send to the White House just before he left office so he could declassify materials related to the FBI probe of Russian interference in the 2016 vote, the source said. The Russia materials included highly classif…