President Donald Trump is blocking the release of some documents about the assassination of President John F. Kennedy, while allowing the disclosure of about 2,800 documents. According to White House officials, some documents are being withheld due to national security concerns. Officials will use a six-month review period to determine whether those could be released. “The remaining records will be released with agency-proposed redactions on a rolling basis in the coming weeks,” White House Press Secretary Sarah Sanders said in a statement. “The President has demanded unprecedented transparency from the agencies and directed them to minimize redactions without delay.” Trump had initially said that all of the files would be released.