Judy Woodruff:

And now to take a closer look at the memorandum released by the White House of the phone conversation between President Trump and Ukraine's President Zelensky, I'm joined by Larry Pfeiffer, former senior director of the White House Situation Room during the Obama administration and chief of staff to the director of the CIA during the Bush administration.

He's currently serving as the director of George Mason University's Hayden Center for Intelligence, Policy and International Security.

Larry Pfeiffer, thank you very much for being here.