Bob's blog: VA chief resigns; Obama seeks new direction for U.S. foreign policy

(CBS News) -- This Sunday on Face the Nation, we'll follow the ongoing turmoil at the Veterans Administration in the wake of the resignation of Gen. Eric Shinseki, who led the organization until Friday. We'll also take a look at America's role in the world as it winds down its presence in Afghanistan. President Obama announced at West Point on Wednesday that U.S. troops would leave the country almost completely by 2016. He also revealed that he would bolster assistance to Syrian rebels fighting President Bashar al-Assad.

Before Obama announced Shinseki's departure, Sen. McCain called on Wednesday for him to leave the post. "I haven't said this before, but I think it's time for Gen. Shinseki to move on," he told CNN. "I was going to wait for the hearing that's going to take place here very soon. But this keeps piling up." What's next for the VA? We'll ask McCain, Senate Veterans Affairs Committee Chairman Bernie Sanders (I-VT) and Robert Wallace, who heads up the Washington office of the VFW.

In Congress, calls for Shinseki's resignation had become impossible for the president to ignore. It would have been very difficult for him to stay.

Shinseki had a distinguished record in the military, and I think many people were reluctant to criticize him or call on him to resign because of that history. But the deeper that you dove into these problems, the worse they looked. The idea that anyone would hold secret lists so people wouldn't know that veterans were waiting for appointments is appalling. There's no other adequate word. Though Gen. Shinseki may have been a good man during his days in the military, obviously someone was not watching the store.

I have contended from the beginning that regardless of who's right and who's wrong in all of this, there needs to be an immediate program to match more doctors with sick veterans, to make sure that the individuals on these lists are being taken care of. It looks like they are beginning to focus on that only now. We're going to stay on this story, because Shinseki's successor will now face daunting process of reforming the VA bureaucracy.

Gen. Michael Hayden, the former director of both the NSA and the CIA, has been a vocal critic of Obama's speech at West Point this week. He will be with us to offer his take on America's role in the world. Has the U.S. weakened its international standing by refraining from intervention in Syria and Ukraine? What lessons should we take away from the wars in Afghanistan and Iraq? We'll cover all that - and more. He'll also weigh in on Edward Snowden's first big US television interview.

As usual, I will speak with a great panel of guests to dive into the week's political news. Joining us are David Ignatius of The Washington Post, David E. Sanger of The New York Times, Leigh Gallagher of Fortune magazine and our Congressional Correspondent Nancy Cordes.