"I can tell you that — and this is something I have told him — that this is a job of such magnitude that you can’t do it by yourself. You are enormously reliant on a team. Your Cabinet, your senior White House staff, all the way to fairly junior folks in their 20s and 30s but who are executing on significant responsibilities. And so, how you put a team together to make sure that they’re getting you the best information and they are teeing up the options from which you will ultimately make decisions. That’s probably the most useful constructive advice and the most constructive advice that I’ve been able to give him, that if you find yourself isolated because the process breaks down or if you’re only hearing from people who agree with you on everything or if you haven’t created a process that is fact-checking and probing and asking hard questions about policies or promises that you’ve made, that’s when you start making mistakes.And as I indicated in some of my previous remarks, reality has a way of biting back if you’re not paying attention to it."