Summary: Season 15 opens on inauguration day with actress Jane Fonda and GQ special correspondent Keith Olbermann as the interview guests. The roundtable includes: Demos president Heather McGhee, author and presidential historian Jon Meacham and former Secretary of Labor and DNC chair candidate Thomas Perez.

Summary: Richard Haass, president of the Council of Foreign Relations and John Avlon, editor-in-chief of the Daily Beast are the interview guests. Bill's roundtable panel includes: actress Eva Longoria, Ohio's Democratic congressman Tim Ryan and the founder and president of Americans for Tax Reform, Grover Norquist.

Summary: Bill's interview guests are African American academic Michael Eric Dyson and actress Leah Remini. Bill's roundtable includes: Missouri's Secretary of State and US veteran Jason Kander, conservative political commentator for 'The Blaze', Tomi Lahren and Republican strategist and Daily Beast contributor Rick Wilson.

Summary: Bill's interview guests are Minnesota Democratic Senator Al Franken and filmmaker John Waters. Bill's roundtable includes: Mail Online editor-at-large Piers Morgan, comic and writer Jim Jeffries and Karine Jean-Pierre from MoveOn.org.

Summary: Bill's interview guests are Milo Yiannopoulos, senior editor of Breitbart News and actress Leah Remini. Bill's roundtable panel includes: comedian and political commentator Larry Wilmore, media commentator and terrorism/intelligence expert Malcolm Nance and former US congressman from Georgia, Jack Kingston.

Summary: Bill's interview guests are: California Republican congressman Darrell Issa, and author Fran Lebowitz. Bill's roundtable includes: actor/producer Seth McFarlane, activist Asra Nomani, and Maine's US Senator Angus King.

Summary: Bill's interview guests are: Environmentalist and founder of 350.org, Bill McKibben and Charlie Sykes from Indivisible. Bill's roundtable include: CNN political commentator Jeffrey Lord, the MSNBC's Joy Reid and author and former Pentagon policy advisor Rosa Brooks.

Summary: Bill's roundtable guests include: Democratic US Senator from Rhode Island Sheldon Whitehouse, former Democratic US Congressman from Massachusetts Barney Frank, CNN anchor and host of "The Lead" Jake Tapper and conservative blogger and contributing editor of New York magazine Andrew Sullivan.

Summary: Bill's interview guests are: Matt Schlapp, chairman of the American Conservative Union and historian Timothy Snyder. Bill's roundtable guests are: MSNBC commentator Chris Hayes, author Max Brooks, and British commentator and former member of Parliament, Louise Mensch.

Summary: Bill's interview guests are: Republican Political Consultant and Trump Confidant, Roger Stone and the Former Director of the National Security Agency, General Michael Hayden. Bill's roundtable guests are: Former Republican US Senator and Presidential Candidate from Pennsylvania, Rick Santorum, President for the Center for American Progress, Neera Tanden and the Founder and CEO of Define America and EmergingUS, Jose Antonio Vargas.

Summary: Bill's interview guests are: former Presidential Candidate and CIA Operative Evan McMullin and Actress/Comedian Chelsea Handler. Bill's roundtable guests are: Democratic Congressman from California, Ted Lieu, Republican Strategist and CNN Commentator Ana Navarro and the New Yorker's Lelani Cobb.

Summary: Bill's interview guest is Arwa Damon. Arwa Damon is an Emmy-winning journalist and CNN’s Senior International Correspondent. Her documentary, “Return to Mosul,” about going back to the city she spent 28 hours hiding in while it was under siege by ISIS, aired last month on CNN. She is co-founder of INARA, a non-profit that helps war wounded children find medical care. Bill's roundtable guests include the President and CEO of the International Rescue Committee, David Miliband, conservative political commentator S.E. Cupp, writer and author Hanna Rosin and the Democratic congressman from Massachusetts, Seth Moulton.

Summary: Bill's interview guest is Democratic Senator from Massachusetts, Elizabeth Warren, author of the book, "This Is Our Fight: The Battle to Save America's Middle Class." Bill's roundtable guests are: venture capitalist Nick Hanauer, film director Rob Reiner, CNN political commentator and editor of "Voices", Tara Setmayer and former Secretary of Energy, Ernest Moniz.

Summary: Bill's interview guest is Ohio's Republican Governor and former Presidential Candidate, John Kasich. The Governor's new book is "Two Paths: America Divided or United." Bill's roundtable guests are Civil Rights Activist Maya Wiley, Novelist and Journalist George Packer, Ex-Deputy Director of the CIA's Counter-Terrorism Center Phillip Mudd and the National Affairs Editor of New York Magazine, Gabriel Sherman.

Summary: Bill's interview guest is the Democratic U.S. Representative for California’s 28th district and the Ranking Member of the House Intelligence Committee, Adam Schiff. Bill's roundtable includes: rapper, actor and activist Michael Render (aka Killer Mike), blogger and libertarian political pundit Matt Welch, political commentator and the former Director of Speechwriting for President Barack Obama Jon Favreau, and actress/comedian Annabelle Gurwitch.

Summary: Bill's interview guest is former special assistant to President Donald Trump, Boris Epshteyn. Bill's roundtable include: Princeton professor and social justice activist Cornell West, former Obama advisor and senior editor of the Atlantic, David Frum and astrophysicist Neil DeGrasse Tyson.

Summary: Bill's interview guest is the Republican United States Senator from Nebraska, Ben Sasse. Bill's roundtable panel includes: former NY State Attorney General Elliot Spitzer, writer-at-large for New York Magazine, Rebecca Traister, the CEO and Co-Founder of Axios, Jim VandeHei and ex-design ethicist for Google, Tristan Harris.

Summary: Bill's interview guest is Michael Eric Dyson, Professor of Sociology at Georgetown University, and the author of "Tears We Cannot Stop: A Sermon to White America." Dyson regularly writes about race and politics in America as a columnist for The New York Times. Bill's roundtable panel includes: CNN political commentator and former 'Meet The Press' moderator David Gregory, the former Republican Congressman from Florida, David Jolly, rapper and actor Ice Cube and the former national press secretary for the Bernie Sanders campaign, Symone Sanders.

Summary: Bill's interview guest is Alex Marlow, who was the first employee of Breitbart News and has been the site's editor-in-chief since 2013. In 2015, Marlow was named to Forbes "30 Under 30" list. Bill's roundtable panel includes MSNBC's chief analyst for terrorism, torture and cyber intelligence, Malcolm Nance, Eurasia Group President Ian Bremmer and actor and comic Eddie Izzard.

Summary: Bill's interview guest is Maajid Nawaz. He is the founder of the world’s first counter-extremism think tank, Quilliam. He is co-author with Sam Harris of Islam and the Future of Tolerance: A Dialogue. Bill's roundtable panel includes: conservative political commentator and prominent 'Never-Trump' member Charlie Sykes, Bianna Golodryga from Yahoo News, the former White House ethics lawyer from the Bush (2) administration, Richard Painter and actor/political activist Bradley Whitford.

Summary: Bill's interview guest is writer Dan Savage. Dan is the writer of the nationally syndicated column, “Savage Love,” and host of the “Savage Lovecast” podcast. Bill's roundtable panel includes the former Republican National Committee chair and MSNBC contributor Michael Steele, BBC America Newsnight anchor Katty Kay, former National Security advisor Richard Clarke and Mediate founder and ABC News chief legal analyst Dan Abrams.

Summary: Bill's interview guest is former Vice President Al Gore. The Oscar® winning filmmaker will discuss his latest project, "An Inconvenient Sequel: Truth to Power." Bill's roundtable panel includes political commentator and pollster Kristen Soltis-Anderson, NYT columnist and best selling author of "The Devil's Bargain", Joshua Green, author of "ISIS: Inside the Army of Terror", Michael Weiss and the chairman of the Faith and Freedom Coalition and author of "Awakening", Ralph Reed.

Summary: Bill's interview guest is English ethologist, evolutionary biologist and author of the new book, 'Science in the Soul', Richard Dawkins. Bill's roundtable panel includes Washington Post columnist and CNN commentator Fareed Zakaria, Pulitizer Prize winning author and presidential historian Jon Meacham and four-time Emmy winning actor Jim Parsons.

Summary: Bill's roundtable panel includes the Democratic U.S. senator from Minnesota, Al Franken, the Democratic Lieutenant Governor from California, Gavin Newsome, political analyst for the Rasmussen Reports, Amy Holmes and comedian/magician Penn Gillette.

Summary: Bill's interview guest is the Rev. Jesse Jackson. Bill's roundtable panel includes Democratic strategist and CNN political contributor Paul Begala, former White House and State Department advisor Nayyera Haq, Editor-At-Large for Reason Magazine Matt Welch and New York Times columnist Frank Bruni.

Summary: Software company executive Ken Bone and environmental activist Xiuhtezcatl Martinez are the interview guests. The panelists are political commentator S.E. Cupp and writer Adam Gopnik.

Summary: Columnist Bret Stephens and fashion guru Tim Gunn are the interview guests. The panelists are authors Fran Lebowitz and Salman Rushdie.

Summary: Former representative Barney Frank and sportscaster Bob Costas are the interview guests. The panelists are columnist Catherine Rampell, actor Martin Short and Republican strategist Rick Wilson.

Summary: Actors Billy Crystal and Russell Brand are the interview guests. The panelists are former representative Harold Ford Jr., journalist Olivia Nuzzi and Republican strategist Steve Schmidt.

Summary: Musician-activist Daryl Davis is an interview guest. The panelists are political strategist James Carville, conservative blogger Erick Erickson and commentator Margaret Hoover.

Summary: Editor Janice Min and musician-activist Daryl Davis are the interview guests. The panelists are political strategist James Carville, conservative blogger Erick Erickson and commentator Margaret Hoover.

Summary: Political strategist Donna Brazile; comedian Sarah Silverman. The roundtable guests are political commentator Chris Matthews and documentary filmmaker Michael Moore.