text:  Well, I was just talking to a colleague about this. I often joke that when you go in to brief Joe Biden, whether he's vice president or the president, he often ends up briefing you. And it's hard. He asks very sharp questions. He challenges you, your core assumptions. That's what he did when I worked for him in the vice president's office. I saw him just a couple of weeks ago in Washington, and that's what he was doing again.