WASHINGTON — President Donald Trump announced Saturday morning that he planned to release the tens of thousands of never-before-seen documents left in the files related to President John F. Kennedy’s assassination held by the National Archives and Records Administration. “Subject to the receipt of further information, I will be allowing, as President, the long blocked and classified JFK FILES to be opened,” Trump tweeted early Saturday. Kennedy assassination experts have been speculating for weeks about whether Trump would disclose the documents.