Frontline filmed four dozen original interviews while making The Facebook Dilemma. Explore many of these interviews — and see how Frontline used them in the film — in this interactive version of The Facebook Dilemma, part of FRONTLINE's Transparency Project.

In reporting The Choice 2016, FRONTLINE conducted dozens of interviews over hundreds of hours in order to better understand the people, moments and forces that have shaped Hillary Clinton and Donald Trump. FRONTLINE is publishing 18 of these conversations. Taken together, this collection offers new insights into who the candidates are -- and how they might lead as president.

Hillary Clinton and Nancy Bekavac were in a small cadre of women attending Yale Law School in the early 1970s. Visiting Clinton in Arkansas in 1974, Bekavac was taken aback by the role women played in public life -- while men talked politics, women stayed "at the table with the Jell-O," she says. In this interview with FRONTLINE, Bekavac discusses what it was like to be part of a trailblazing group of women at Yale Law School, her long friendship with Hillary and the price she says Clinton has paid for being a pioneer.

Jim Dowd was tapped to manage publicity for "The Apprentice" and its star, Donald Trump, before the show premiered in 2004. This introduction of Trump to the rest of America was "the beginning of [a] potential political career," he tells FRONTLINE. "Oddly enough, firing people on television each week made him likable."

Famed "Washington Post" reporter Carl Bernstein calls Hillary Clinton "the most famous woman in the world." In his biography of Clinton, "A Woman in Charge: The Life of Hillary Rodham Clinton," Bernstein examined her family, faith and record. In this interview with FRONTLINE, Bernstein discusses Clinton's relationship with her parents, the influence of a Methodist pastor who shaped her world view as a teenager, and a secret that Clinton kept for more than 30 years.

Nikki Haskell claims to be the first television producer to have interviewed Donald Trump, and has been friends with him ever since. Haskell helped Trump make connections in New York: "How else are you going to become an important person if you don’t hang around important people?" she remembers telling him in this interview with FRONTLINE.

As a lawyer in Fayetteville, Jim Blair met Hillary Clinton at University of Arkansas Law School. In this interview with FRONTLINE, Blair recalls the Hillary Clinton who first arrived in Arkansas, discusses how a commodities trading deal he advised her on become one of the early controversies of her public life, and what Clinton's reaction to his wife's cancer diagnosis and death reveals about the woman he has called a friend for more than 40 years.

A childhood friend of Bill Clinton's, Mack McLarty was the chairman of the Democratic Party in Arkansas when he met Hillary Rodham. The two worked together on Bill Clinton's Arkansas campaigns, and McLarty later became President Clinton's White House Chief of Staff. In this interview with FRONTLINE, he discusses the Clintons’ relationship, Hillary's involvement in Bill's political career and the difficulties she faced in Washington.

Hired in 1987 as Vice President of Trump Plaza casino in Atlantic City, Jack O'Donnell would become a critic of Donald Trump. He says he became particularly disillusioned with his boss after a helicopter crash in 1989 killed two casino executives. In this interview with FRONTLINE, O'Donnell says Trump began "blaming these problems on two people that had died while working for him."

A former Washington Post journalist, Lissa Muscatine became a speechwriter for First Lady Hillary Clinton in 1993. In this interview with FRONTLINE, she describes the experience of working closely with Clinton and tells the story behind some of the speeches that have defined her to America and the world.

As Hillary Clinton’s former chief of staff, Melanne Verveer recalls that Washington did not know what to do with a professional woman as first lady. The advice Clinton received was, "be a traditional first lady. Take a single issue and let that just be your issue,'" says Verveer. "And that wasn't Hillary Clinton."

Louise Sunshine helped Donald Trump open his first office in Manhattan. She was involved in the development of Trump Tower and the growth of the "Trump" brand. In this interview with FRONTLINE, she discusses the deals that made Trump wealthy and famous, how he became "a genius at manipulating the press" and how imaginary "Trump earplugs" sometimes helped her tune him out.