National elections

Democratic presidential candidate Sen. Kamala Harris, D-Calif., speaks at an SEIU event before the 2019 California Democratic Party State Organizing Convention in San Francisco, Saturday, June 1, 2019. (AP Photo/Jeff Chiu)

In this Friday, May 31, 2019, photo, Oriana Shulevitz Rosado, left, and Donna West watch as Democratic presidential candidate Sen. Elizabeth Warren, D-Mass., speaks via videoconference at West's home in Las Vegas. The chair of the Rural Nevada Democratic Caucus organized the virtual visit with groups around the state to ensure voters in sparsely-populated areas can play a role in vetting the party's crowded field of White House hopefuls. (AP Photo/John Locher)

FILE - In this Jan. 3, 2017, file photo, then-Vice President Joe Biden, right, shakes hands with Sen. Kamala Harris, D-Calif., as her husband Douglas Emhoff, watches during a a mock swearing in ceremony in the Old Senate Chamber on Capitol Hill in Washington. Most of the two dozen White House hopefuls have pre-existing friendships from their time on Capitol Hill or other Democratic circles. But few are as complex _ and potentially awkward _ as the tie between Harris and Biden. (AP Photo/Kevin Wolf, File)

FILE - In this May 24, 2019, file photo, Speaker of the House Nancy Pelosi, D-Calif., speaks during a panel discussion at Delaware County Community College in Media, Pa. Pelosi’s impeachment balancing act is toggling between mounting pressure from Democrats who want to impeach President Donald Trump and her own political instincts for a more measured, “ironclad” investigation. (AP Photo/Matt Slocum, File)

FILE - In this Sept. 26, 2018, file photo, Honduran President Juan Orlando Hernandez addresses the 73rd session of the United Nations General Assembly at the United Nations headquarters. Recently unsealed testimony shows that a brother of the Honduran president admitted to U.S. federal agents that he'd accepted presents from violent drug traffickers he'd known for years and once asked Honduran officials about money the government allegedly owed the traffickers. (AP Photo/Frank Franklin II, File)

President Donald Trump talks with reporters before departing on Marine One for the Air Force Academy graduation ceremony, Thursday, May 30, 2019, in Washington. (AP Photo/Evan Vucci)

Ukrainian Prime Minister Volodymyr Groysman gestures as he addresses the Ukrainian parliament in Kiev, Ukraine, Thursday, May 30, 2019. Ukrainian lawmakers refused to accept the Cabinet's resignation in a snub to the nation's newly-sworn president, Volodymyr Zelenskiy, who wants to form his own team but faces parliament dominated by supporters of his election rival. (AP Photo/Efrem Lukatsky)

FILE - In this May 6, 2019, file photo, Democratic presidential candidate and former Texas Congressman Beto O'Rourke speaks to the media following a roundtable discussion on climate change in Des Moines, Iowa. Top Democratic presidential candidates are one-upping each other with ever-more-ambitious plans on global warming, gun violence, health care and abortion. But largely left out of the policy parade are the thousands of immigrants flooding the U.S. border to seek asylum (AP Photo/Charlie Neibergall, File

Special counsel Robert Mueller speaks at the Department of Justice Wednesday, May 29, 2019, in Washington, about the Russia investigation. (AP Photo/Carolyn Kaster)