President Biden, during an interview with ABC News, called to change the way the controversial Senate filibuster functions. Drew Angerer/Getty Images hide caption

President Trump emerges from the Oval Office on Wednesday as he departs the White House en route to Florida's Mar-a-Lago, where he will spend Christmas and New Year's Eve. Samuel Corum/AFP via Getty Images hide caption

President-elect Joe Biden speaks about the Electoral College vote certification process Monday in Wilmington, Del. Drew Angerer/Getty Images hide caption

Vice President-elect Kamala Harris delivers remarks Saturday night in Wilmington, Del. Angela Weiss/AFP via Getty Images hide caption

Democratic presidential nominee and former Vice President Joe Biden speaks at Miramar Regional Park in Miramar, Fla., on Tuesday, as supporters watch from their cars. Carolyn Kaster/AP hide caption

President Trump leaves Walter Reed National Military Medical Center in Bethesda, Md., on Monday. He announced Tuesday he was pausing negotiations on a coronavirus relief package. Saul Loeb/AFP via Getty Images hide caption

Sen. Amy Klobuchar, D-Minn., attends a Senate Judiciary Committee hearing on police use of force earlier this week. Tom Williams/Pool/AFP via Getty Images hide caption

President Trump speaks during an event on police reform in the Rose Garden of the White House Tuesday. Evan Vucci/AP hide caption

The Robert F. Kennedy Department of Justice Building in Washington, D.C. Andrew Harnik/AP hide caption

Michael Atkinson arrives at the Capitol last October, where he was questioned about the whistleblower complaint that exposed a controversial July phone call the president had with Ukrainian President Volodymyr Zelenskiy. J. Scott Applewhite/AP hide caption

Response coordinator for White House Coronavirus Task Force Dr. Deborah Birx speaks at Monday's press briefing as she points at a graphic. Mandel Ngan/AFP via Getty Images hide caption

President Trump signs the CARES Act, a $2 trillion rescue package to provide economic relief amid the coronavirus outbreak, at the Oval Office on Friday. Jim Watson/AFP via Getty Images hide caption

Senate Majority Leader Sen. Mitch McConnell walks into his office after he spoke on the Senate floor Thursday. Alex Wong/Getty Images hide caption

Rep. Mario Diaz-Balart, R-Fla., said on Wednesday that he tested positive for COVID-19, making him the first member of Congress to contract the coronavirus. Alex Brandon/AP hide caption

Milwaukee (left), Pueblo, Colo., and Charlotte, N.C. are three of the locations NPR's Where Voters Are project will highlight throughout the year. Eric Baradat/AFP, Kevin J. Beaty for NPR and Daniel Slim/AFP via Getty Images hide caption

Democrats say President Trump is exacting "retribution" on Gordon Sondland (left), the outgoing U.S. ambassador to the European Union, and Lt. Col. Alexander Vindman because they testified in the impeachment hearings. Drew Angerer and Andrew Caballero-Reynolds/AFP via Getty Images hide caption

Democratic presidential candidate Sen. Elizabeth Warren called out Sen. Bernie Sanders, I-Vt., after Tuesday's debate. Patrick Semansky/AP hide caption

"You are the ones bringing pain and suffering to our Republic for your own selfish personal, political, and partisan gain," President Trump said of Democrats in a letter to House Speaker Nancy Pelosi on Tuesday. Above, Trump greets Guatemalan President Jimmy Morales at the White House on Tuesday. Brendan Smialowski/AFP via Getty Images hide caption

House Judiciary Committee Chairman Jerry Nadler had adjourned Thursday without a vote on the articles of impeachment. Ranking member Doug Collins (in background) likened the move to a "kangaroo court." J. Scott Applewhite/AP hide caption

House Speaker Nancy Pelosi and the chairs of investigative committees announce the articles of impeachment against President Trump on Tuesday. Saul Loeb/AFP via Getty Images hide caption

Former Vice President and 2020 presidential candidate Joe Biden speaks to voters at Johnson's Reception Hall in Elkader, Iowa. KC McGinnis for NPR hide caption

State Department employee Christopher Anderson is testifying behind closed doors on Capitol Hill on Wednesday about the Trump administration's policy on Ukraine. Win McNamee/Getty Images hide caption

House investigators are speaking with Ukraine expert Lt. Col. Alexander S. Vindman as part of their impeachment inquiry into President Trump on Tuesday. Patrick Semansky/AP hide caption

The flag-draped casket of U.S. Rep. Elijah Cummings (D-MD) is seen at Chamber doors in the Will Rodgers Corridor as the late congressman is prepared to lie in state during a memorial service at the Statuary Hall of the U.S. Capitol October 24, 2019 in Washington, DC. Rep. Cummings passed away on October 17, 2019 at the age of 68 from "complications concerning longstanding health challenges." Mandel Ngan/Pool/Getty Images hide caption