The Washington Post: The Trump administration unveiled a new crackdown Friday on journalists at the Pentagon, saying it will require them to pledge they won't gather any information - even unclassified - that hasn't been expressly authorized for release, and will revoke the press credentials of those who do not obey. Under the policy, the Pentagon may revoke press passes for anyone it deems a security threat. Possessing confidential or unauthorized information, under the new rules, would be gro…