Joe Biden's inauguration rehearsal goes on amid tension, false alarm

Final preparations are made ahead of the 59th presidential inauguration at the U.S. Capitol in Washington, Tuesday, Jan. 19, 2021. ((AP Photo/Carolyn Kaster))

Staff members clean the glass on a protective shield and the podium before President-elect Joe Biden speaks during a COVID-19 memorial, with lights placed around the Lincoln Memorial Reflecting Pool, Tuesday, Jan. 19, 2021, in Washington. ((AP Photo/Alex Brandon))

U.S. President-elect Joe Biden and his wife, Jill Biden, arrive at Joint Base Andrews in Maryland, U.S. January 19, 2021. (REUTERS/Tom Brenner)

President-elect Joe Biden and his wife, Jill Biden, are joined by Vice President-elect Kamala Harris and her husband, Doug Emhoff, during a COVID-19 memorial event at the Lincoln Memorial Reflecting Pool, Tuesday, Jan. 19, 2021, in Washington. ((AP Photo/Evan Vucci))

Vice President-elect Kamala Harris speaks during a COVID-19 memorial, with lights placed around the Lincoln Memorial Reflecting Pool, Tuesday, Jan. 19, 2021, in Washington. ((AP Photo/Alex Brandon))

President-elect Joe Biden and his wife, Jill Biden, listen as Vice President-elect Kamala Harris speaks during a COVID-19 memorial, with lights placed around the Lincoln Memorial Reflecting Pool, Tuesday, Jan. 19, 2021, in Washington. ((AP Photo/Alex Brandon))

Speaker of the House Nancy Pelosi, D-Calif., center, and the House Democratic leadership hold COVID-19 memorial and lighting ceremony on the steps of the Capitol in Washington, Tuesday, Jan. 19, 2021. Majority Leader Steny Hoyer, D-Md., right, and Rep. Katherine Clark, D-Mass., left. ((AP Photo/J. Scott Applewhite))

A field of flags is spread across the National Mall, with the Washington Monument in the background on Tuesday, Jan. 19, 2021, as seen from the West Front of the U.S. Capitol on the evening ahead of the 59th presidential inauguration in Washington. ((AP Photo/Susan Walsh))

Lights surround the Lincoln Memorial Reflecting Pool, placed as a memorial to COVID-19 victims Tuesday, Jan. 19, 2021, in Washington, after President-elect Joe Biden spoke, with the U.S. Capitol in the background. ((AP Photo/Alex Brandon))

Stand-ins for President-elect Joe Biden and Jill Biden walk to the podium during a rehearsal for the 59th presidential inauguration at the U.S. Capitol in Washington, Monday, Jan. 18, 2021. ((Win McNamee/Pool via AP))

U.S. Marine Corps. stand by a door of the U.S. Capitol during a dress rehearsal for the 59th inaugural ceremony for President-elect Joe Biden and Vice President-elect Kamala Harris at the Capitol, Monday, Jan. 18, 2021, in Washington. ((Jim Lo Scalzo/Pool via AP))

A stand-in for President-elect Joe Biden is sworn in on the podium, as a stand-in for Jill Biden looks on, during a rehearsal for the 59th presidential inauguration at the U.S. Capitol in Washington, Monday, Jan. 18, 2021. ((Erin Schaff/The New York Times via AP, Pool))

Members of the military band participate in a dress rehearsal for the 59th inaugural ceremony for President-elect Joe Biden and Vice President-elect Kamala Harris at the Capitol, Monday, Jan. 18, 2021, in Washington. ((Erin Schaff/The New York Times via AP, Pool))

Preparations are made prior to a dress rehearsal for the 59th inaugural ceremony for President-elect Joe Biden and Vice President-elect Kamala Harris at the Capitol, Monday, Jan. 18, 2021, in Washington. ((Jeenah Moon/Pool via AP))

A member of the Military Honor Guard stands during a dress rehearsal for the 59th inaugural ceremony for President-elect Joe Biden and Vice President-elect Kamala Harris at the Capitol, Monday, Jan. 18, 2021, in Washington. ((Erin Schaff/The New York Times via AP, Pool))

Stand-ins for President-elect Joe Biden and Jill Biden participate in a dress rehearsal for the 59th inaugural ceremony for President-elect Joe Biden and Vice President-elect Kamala Harris at the Capitol, Monday, Jan. 18, 2021, in Washington. ((Rod Lamkey/Pool via AP))

Flags are placed on the National Mall, with the U.S. Capitol behind them, ahead of the inauguration of President-elect Joe Biden and Vice President-elect Kamala Harris, Monday, Jan. 18, 2021, in Washington. ((AP Photo/Alex Brandon))

National Guardsmen stand outside the U.S. Capitol before a dress rehearsal for the 59th inaugural ceremony for President-elect Joe Biden and Vice President-elect Kamala Harris at the Capitol, Monday, Jan. 18, 2021, in Washington. ((Rod Lamkey/Pool via AP))

A large American flag is placed on the National Mall, with the U.S. Capitol behind, ahead of the inauguration of President-elect Joe Biden and Vice President-elect Kamala Harris, Monday, Jan. 18, 2021, in Washington. ((AP Photo/Alex Brandon))

A large flag is placed on the National Mall, with the U.S. Capitol behind it, ahead of the inauguration of President-elect Joe Biden and Vice President-elect Kamala Harris, Monday, Jan. 18, 2021, in Washington. ((AP Photo/Alex Brandon))

Flags are placed on the National Mall, with the Washington Monument behind them, and lights shine into the sky, ahead of the inauguration of President-elect Joe Biden and Vice President-elect Kamala Harris, Monday, Jan. 18, 2021, in Washington. ((AP Photo/Alex Brandon))

A National Guardsman stands at the Lincoln Memorial as the Washington Memorial looms in the background as security measures are heightened ahead of President-elect Joe Biden's inauguration ceremony, Monday, Jan. 18, 2021, in Washington. ((AP Photo/David Goldman))

Ceremonial troops of the 3rd United States Infantry, also known as the The Old Guard, march during rehearsal for the inauguration of President-elect Joe Biden and Vice President-elect Kamala Harris along Pennsylvania Avenue in front of the White House, Monday, Jan. 18, 2021, in Washington. ((AP Photo/Manuel Balce Ceneta))

A ceremonial honor guard marches past the White House as members rehearse for the President-elect Joe Biden's inauguration ceremony, Monday, Jan. 18, 2021, in Washington. ((AP Photo/David Phillip)1)

Flags are placed on the National Mall ahead of the inauguration of President-elect Joe Biden and Vice President-elect Kamala Harris, Monday, Jan. 18, 2021, in Washington. ((AP Photo/Alex Brandon))

Members of the United States Air Force march during rehearsal for the inauguration of President-elect Joe Biden and Vice President-elect Kamala Harris along Pennsylvania Avenue in front of the White House, Monday, Jan. 18, 2021, in Washington. ((AP Photo/Manuel Balce Ceneta))

Members of the military march in formation on Pennsylvania Avenue in front of the White House in Washington, as they rehearse ahead of President-elect Joe Biden's inauguration ceremony, Monday, Jan. 18, 2021. ((AP Photo/Pablo Martinez Monsivais))

Members of the Old Guard Fife and Drum Corps march during rehearsal for the inauguration of President-elect Joe Biden and Vice President-elect Kamala Harris along Pennsylvania Avenue in front of the White House, Monday, Jan. 18, 2021, in Washington. ((AP Photo/Manuel Balce Ceneta))

A view of the stage on Capitol Hill in Washington, Tuesday, Jan. 19, 2021, ahead of the 59th Presidential Inauguration on Wednesday. ((AP Photo/Susan Walsh, Pool))