Sen. Michael Bennet, a Colorado Democrat, has dropped out of the 2020 presidential race. Alex Edelman/Getty Images hide caption

Precinct secretary Ari Fleisig at a caucus precinct site in Des Moines, Iowa, on Monday. The Iowa Democratic Party said that the data collected "was sound" despite the smartphone app malfunction. Michael Zamora/NPR hide caption

Six candidates have qualified for next Tuesday's Democratic debate: former South Bend, Ind., Mayor Pete Buttigieg, Massachusetts Sen. Elizabeth Warren, former Vice President Joe Biden, Vermont Sen. Bernie Sanders, Minnesota Sen. Amy Klobuchar and businessman Tom Steyer. Chris Carlson/AP hide caption

Rep. Duncan Hunter, R-Calif., leaves federal court after a hearing last October. Denis Poroy/AP hide caption

President Trump says Qassem Soleimani was plotting "imminent and sinister attacks on American diplomats and personnel," in a statement at the Mar-a-Lago estate in Palm Beach, Fla., on Friday afternoon. Jim Watson/Getty Images hide caption

President Trump shakes hands with House Speaker Nancy Pelosi as Vice President Pence looks on in the House chamber before giving his State of the Union address to a joint session of Congress on Feb. 5, 2019. Doug Mills/AP hide caption

House Speaker Nancy Pelosi, D-Calif., holds hands with Rep. Debbie Dingell, D-Mich., as they walk to the chamber where the House begins debate on the impeachment charges against President Trump. J. Scott Applewhite/AP hide caption

Democratic presidential candidates Sen. Elizabeth Warren, former Vice President Joe Biden and Sen. Bernie Sanders participate in the November Democratic presidential primary debate. John Bazemore/AP hide caption

House Judiciary Committee ranking member Rep. Doug Collins, R-Ga., right, gives his opening statement during a House Judiciary Committee markup of the articles of impeachment against President Donald Trump on Wednesday. Committee Chairman Jerry Nadler, D-N.Y., left, looks on. Jacquelyn Martin/AP hide caption

Democratic presidential candidate businessman Andrew Yang speaks during an interview in Chicago. Yang has qualified for the sixth Democratic primary debate next week. Teresa Crawford/AP hide caption

Ranking member Rep. Devin Nunes, R-Calif., makes an opening statement as former White House national security aide Fiona Hill, and David Holmes, a U.S. diplomat in Ukraine, testify before the House Intelligence Committee on Capitol Hill last month. Andrew Harnik/AP hide caption

Rep. Duncan Hunter, R-Calif., leaves federal court after a hearing in San Diego in July. Denis Poroy/AP hide caption

President Trump, Vice President Pence and first lady Melania Trump present Conan, the military working dog injured in the successful operation targeting Islamic State leader Abu Bakr al-Baghdadi, before the media in the Rose Garden at the White House on Monday. Evan Vucci/AP hide caption

Former New York City Mayor Michael Bloomberg is weighing a 2020 presidential run. He'd join two other wealthy, self-funding Democrats in the primary: John Delaney and Tom Steyer. Monica Schipper/Getty Images hide caption

After a recanvass of last week's election was largely completed, Kentucky Republican Gov. Matt Bevin is conceding to his Democratic challenger, Andy Beshear. Timothy D. Easley/AP hide caption

Then-Massachusetts Gov. Deval Patrick speaks at the 2012 Democratic National Convention in Charlotte, N.C. Deval has announced he will enter the 2020 presidential race. Alex Wong/Getty Images hide caption

Former Vice President Joe Biden, Massachusetts Sen. Elizabeth Warren, Vermont Sen. Bernie Sanders, Minnesota Sen. Amy Klobuchar and South Bend, Ind., Mayor Pete Buttigieg are some of the 10 candidates who have qualified for the Democratic presidential primary debate next week on Nov 20. Getty Images hide caption