Stephen Hayes at The Weekly Standard has this from Sen. John McCain (R., Ariz.):

If the president fires McChrystal, we need a new ambassador and we need an entire new team over there. But most importantly, we need the president to say what Secretary Clinton and Secretary Gates have both said but what the president refuses to say: Our withdrawal in the middle of 2011 will be conditions based. It’s got to be conditions based and he’s got to say it.