Ten democratic presidential candidates appear onstage before the start of the Democratic Presidential Debate at Texas Southern University in Houston on Thursday. Win McNamee/Getty Images hide caption
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Sen. Bernie Sanders shakes hands with former Vice President Joe Biden Thursday. Michael Zamora/NPR hide caption
In Houston on Thursday, Democratic presidential hopefuls Mayor Pete Buttigieg, Sen. Bernie Sanders, former Vice President Joe Biden and Sen. Elizabeth Warren participate in the third Democratic primary debate of the 2020 presidential campaign season. Robyn Beck/AFP/Getty Images hide caption
Former Texas Rep. Beto O'Rourke has promised a mandatory buyback program for assault-style weapons. But public support for such a program is divided. Win McNamee/Getty Images hide caption
Former Vice President Joe Biden takes the stage Thursday at the third Democratic debate, which took place at Texas Southern University in Houston. Michael Zamora/NPR hide caption
Ten candidates are on the stage for September's one-night Democratic debate on Thursday night. Angela Hsieh/NPR hide caption
National Security Adviser John Bolton left the Trump administration earlier this week. Alex Wong/Getty Images hide caption
Democratic presidential hopefuls (from left): Sen. Cory Booker, D-N.J., former Vice President Joe Biden, and Sen. Kamala Harris, D-Calif., onstage before the July debate. Brendan Smialowski/AFP/Getty Images hide caption
Democratic presidential candidate Sen. Elizabeth Warren speaks to supporters at the Shrine Auditorium in Los Angeles last month. Mario Tama/Getty Images hide caption
Poll: Democrats Most Like Warren, But Voters Overall Are Lukewarm On Democrats, Trump
Dan Bishop, center, smiles as he gets up from the table after looking at election results with supporters during an election night party Tuesday in Monroe, N.C. September 10, 2019 in Monroe, N.C. Brian Blanco/Getty Images hide caption
Antonio Basco, husband of El Paso Walmart shooting victim Margie Reckard, hugs an attendee during his wife's visitation service in El Paso, Texas, in August. Paul Ratje/AFP/Getty Images hide caption
President Trump on stage with Republican candidate Dan Bishop during a campaign rally in Fayetteville, N.C., on Monday. The do-over congressional election may test whether reliably Republican suburban voters are still loyal. Jim Watson/AFP/Getty Images hide caption
The headquarters of the military intelligence agency GRU in Moscow. The FBI and other U.S. agencies want to stop more interference like that launched from here against the U.S. in 2016. Pavel Golovkin/AP hide caption
With Next Goal To Secure 2020 Elections, Feds Seek To Absorb Lessons From 2016
From the Democratic presidential debates hosted in Detroit, candidates (left) Marianne Williamson, Rep. Tim Ryan, Sen. Amy Klobuchar, Mayor Pete Buttigieg, Sen. Bernie Sanders, Sen. Elizabeth Warren, former Rep. Beto O'Rourke former Gov. John Hickenlooper, Rep. John Delaney, and Gov. Steve Bullock. Michael Zamora/NPR hide caption
The U.S. has spent hundreds of millions of dollars since 2016 to make election practices at every level of government more secure. Mark Ralston /AFP/Getty Images hide caption
Ahead of the 2020 elections, 15 Republican House members have announced plans to retire, including (from left) Republican Reps. Will Hurd of Texas, Martha Roby of Alabama, Pete Olson of Texas and Rob Woodall of Georgia. Bill Clark, Tom Williams/CQ Roll Call/Getty Images hide caption
President Trump walks off stage after a campaign rally at the SNHU Arena in Manchester, N.H., last month. Nicholas Kamm/AFP/Getty Images hide caption