Televised impeachment hearings begin today in the inquiry into whether President Trump withheld military aid from Ukraine to pressure the Ukrainian president to investigate his political rivals. Two witnesses are testifying today before the House Intelligence Committee: George Kent, a deputy assistant secretary of state, and William Taylor, a former ambassador and the top U.S. diplomat in Ukraine. Both officials have privately told congressional investigators that Trump withheld aid to Ukraine in an attempt to pressure Ukraine to investigate Joe Biden and his son Hunter. Donald Trump is just the fourth U.S. president to face an impeachment inquiry. Bill Clinton was impeached in 1998. Andrew Johnson was impeached in 1868. Richard Nixon resigned in 1974 prior to an impeachment vote. We speak with the legendary journalist Bill Moyers, who covered the Nixon and Clinton impeachment hearings. In the 1960s, Moyers was a founding organizer of the Peace Corps and served as press secretary for President Lyndon Johnson. In 1971, he began an award-winning career as a television broadcaster that would last for over four decades. During that time, Moyers received over 30 Emmys and countless other prizes. He was elected to the Television Hall of Fame in 1995. Last week Bill Moyers took out a full-page ad in The New York Times urging PBS to broadcast the impeachment hearings live and to rerun them in primetime.