Coming up Sunday: Gowdy, Cummings, Axelrod, and Woodward

(CBS News) -- The first Democratic primary debate of the 2016 cycle has passed, but another big test for Hillary Clinton - her long-awaited testimony before the House Select Committee on Benghazi - is fast approaching. This Sunday on "Face the Nation," we'll have the latest on both stories, along with a fresh take on Watergate from legendary reporter Bob Woodward.

First, we'll talk with the Republican chairman of the Benghazi panel, South Carolina Rep. Trey Gowdy, about what he hopes to learn from Clinton's testimony next Thursday, and where he sees his investigation going thereafter. His committee has come under fire recently from critics who say its work has more to do with damaging Clinton politically than discovering the truth about the Benghazi terror attack.

We'll also talk to the committee's ranking Democrat, Maryland Rep. Elijah Cummings about his recent suggestion that the committee should wrap up its work - What does he think of the panel's work to date? And is he satisfied that all of the questions surrounding Benghazi have been answered?

And during a chat with Democratic strategist David Axelrod, we'll discuss the recent Democratic primary debate. Was Clinton's performance strong enough to quiet concerns among some Democrats about her record and her candidacy? And is there still an opening in the field for Vice President Biden?

As always, we'll get some sage analysis on these and other stories from our expert panel, including The Atlantic's Jeffrey Goldberg, Bloomberg's Mark Halperin, the Washington Post's Bob Woodward, and CBS News congressional correspondent Nancy Cordes.

Finally, Woodward will discuss his latest book, "The Last of the President's Men," which offers some new details about one man at the center of the Watergate scandal that brought down former President Richard Nixon more than 40 years ago.

You can see all that and more on "Face the Nation" this Sunday. We hope you join us! Check your local listings for airtimes.