Defense Secretary Jim Mattis expressed solidarity with President Trump’s stripping of former Obama CIA Director John Brennan’s security clearance earlier this week. “All I can tell you is, I have taken security clearances away from people in my previous time in uniform, and a security clearance is something that is granted on an as-needed basis,” he told Pentagon reporters traveling with him in South America on Friday. The comment came in response to a question on what he thought about former intelligence officials denouncing the president for stripping Brennan’s security clearance. Earlier this week, retired Navy Adm. Bill McRaven published...