Xavier Becerra, secretary of Health and Human Services (HHS) nominee for U.S. President Joe Biden, prepares to testify before the Senate Health, Education, Labor and Pensions Committee in Washington, D.C., U.S., on Tuesday, Feb. 23, 2021. Biden's pick to lead HHS gives him a fierce defender of Democratic causes but one without hands-on experience leading a massive federal agency in the middle of an unprecedented public health crisis. Photographer: Sarah Silbiger/Bloomberg

Senator Cory Booker, a Democrat from New Jersey, speaks during a hearing in Washington, D.C., U.S., on Wednesday, Sept. 30, 2020. The committee is exploring the Federal Bureau of Investigations investigation of the 2016 Trump campaign and Russian election interference. Photographer: Stefani Reynolds/Bloomberg

Senator Cory Booker, a Democrat from New Jersey, speaks during a hearing in Washington, D.C., U.S., on Wednesday, Sept. 30, 2020. The committee is exploring the Federal Bureau of Investigations investigation of the 2016 Trump campaign and Russian election interference. Photographer: Stefani Reynolds/Bloomberg

Democratic presidential nominee and former Vice President Joe Biden and his wife Jill, former New York City Mayor Michael Bloomberg, U.S. Vice President Mike Pence and his wife Karen all stand with their hands over their hearts as they attend ceremonies marking the 19th anniversary of the September 11, 2001 attacks on the World Trade Center at the 911 Memorial & Museum in New York City, New York, U.S., September 11, 2020. REUTERS/Eduardo Munoz

Former 2020 Democratic presidential candidate and former New York Mayor Michael Bloomberg speaks by video feed during the 4th and final night of the 2020 Democratic National Convention, as participants from across the country are hosted over video links from the originally planned site of the convention in Milwaukee, Wisconsin, U.S. August 20, 2020. 2020 Democratic National Convention/Pool via REUTERS

Former 2020 Democratic presidential candidate and former New York Mayor Michael Bloomberg speaks by video feed during the 4th and final night of the 2020 Democratic National Convention, as participants from across the country are hosted over video links from the originally planned site of the convention in Milwaukee, Wisconsin, U.S. August 20, 2020. 2020 Democratic National Convention/Pool via REUTERS

Former 2020 Democratic presidential candidate and former New York Mayor Michael Bloomberg speaks by video feed during the 4th and final night of the 2020 Democratic National Convention, as participants from across the country are hosted over video links from the originally planned site of the convention in Milwaukee, Wisconsin, U.S. August 20, 2020. 2020 Democratic National Convention/Pool via REUTERS

Former 2020 Democratic presidential candidate and former New York Mayor Michael Bloomberg speaks by video feed during the 4th and final night of the 2020 Democratic National Convention, as participants from across the country are hosted over video links from the originally planned site of the convention in Milwaukee, Wisconsin, U.S. August 20, 2020. 2020 Democratic National Convention/Pool via REUTERS

Former 2020 Democratic presidential candidate and former New York Mayor Michael Bloomberg speaks by video feed during the 4th and final night of the 2020 Democratic National Convention, as participants from across the country are hosted over video links from the originally planned site of the convention in Milwaukee, Wisconsin, U.S. August 20, 2020. 2020 Democratic National Convention/Pool via REUTERS

Former Democratic U.S. presidential candidate Mike Bloomberg appears before supporters after ending his campaign for president in Manhattan in New York City, New York, U.S., March 4, 2020. REUTERS/Carlo Allegri

Former Democratic U.S. presidential candidate Mike Bloomberg appears before supporters after ending his campaign for president in Manhattan in New York City, New York, U.S., March 4, 2020. REUTERS/Carlo Allegri

Supporters of former Democratic U.S. presidential candidate Mike Bloomberg listen as he speaks after ending his campaign for president in Manhattan in New York City, New York, U.S., March 4, 2020. REUTERS/Carlo Allegri

Former Democratic U.S. presidential candidate Mike Bloomberg appears before suppoters after ending his campaign for president after ending his campaign for president in Manhattan in New York City, New York, U.S., March 4, 2020. REUTERS/Carlo Allegri

Diana Taylor, partner of former Democratic U.S. presidential candidate Mike Bloomberg looks on as he speaks to suppoters after ending his campaign for president in Manhattan in New York City, New York, U.S., March 4, 2020. REUTERS/Carlo Allegri

Former Democratic U.S. presidential candidate Mike Bloomberg waves to supporters after ending his campaign for president in Manhattan in New York City, New York, U.S., March 4, 2020. REUTERS/Carlo Allegri

Former Democratic U.S. presidential candidate Mike Bloomberg speaks after ending his campaign for president in Manhattan in New York City, New York, U.S., March 4, 2020. REUTERS/Carlo Allegri

Supporters of former Democratic U.S. presidential candidate Mike Bloomberg listen as he speaks after ending his campaign for president in Manhattan in New York City, New York, U.S., March 4, 2020. REUTERS/Carlo Allegri

Former Democratic U.S. presidential candidate Mike Bloomberg appears at a news conference after ending his campaign for president in Manhattan in New York City, New York, U.S., March 4, 2020. REUTERS/Carlo Allegri

Former Democratic U.S. presidential candidate Mike Bloomberg appears at a news conference after ending his campaign for president in Manhattan in New York City, New York, U.S., March 4, 2020. REUTERS/Carlo Allegri

Former Democratic U.S. presidential candidate Mike Bloomberg appears at a news conference after ending his campaign for president in Manhattan in New York City, New York, U.S., March 4, 2020. REUTERS/Carlo Allegri

Former Democratic U.S. presidential candidate Mike Bloomberg appears at a news conference after ending his campaign for president in Manhattan in New York City, New York, U.S., March 4, 2020. REUTERS/Carlo Allegri

Former Democratic U.S. presidential candidate Mike Bloomberg appears at a news conference after ending his campaign for president in Manhattan in New York City, New York, U.S., March 4, 2020. REUTERS/Carlo Allegri

Former Democratic U.S. presidential candidate Mike Bloomberg appears at a news conference after ending his campaign for president in Manhattan in New York City, New York, U.S., March 4, 2020. REUTERS/Carlo Allegri

Supporters of democratic presidential candidate and former New York Mayor Michael Bloomberg attend his Super Tuesday rally in West Palm Beach, Florida, U.S., March 3, 2020. REUTERS/Marco Bello

Supporters of democratic presidential candidate and former New York Mayor Michael Bloomberg attend his Super Tuesday rally in West Palm Beach, Florida, U.S., March 3, 2020. REUTERS/Marco Bello

Supporters of Democratic presidential candidate and former New York Mayor Michael Bloomberg attend his Super Tuesday rally in West Palm Beach, Florida, U.S., March 3, 2020. REUTERS/Marco Bello

Supporters of Democratic presidential candidate and former New York Mayor Michael Bloomberg attend his Super Tuesday rally in West Palm Beach, Florida, U.S., March 3, 2020. REUTERS/Marco Bello

Democratic U.S. presidential candidate Michael Bloomberg greets voters after speaking at his Super Tuesday night rally in West Palm Beach, Florida, U.S., March 3, 2020. REUTERS/Marco Bello

Democratic U.S. presidential candidate Michael Bloomberg greets voters after speaking at his Super Tuesday night rally in West Palm Beach, Florida, U.S., March 3, 2020. REUTERS/Marco Bello

Democratic U.S. presidential candidate Michael Bloomberg attends his Super Tuesday night rally in West Palm Beach, Florida, U.S., March 3, 2020. REUTERS/Maria Alejandra Cardona

Democratic U.S. presidential candidate Michael Bloomberg greets voters after speaking at his Super Tuesday night rally in West Palm Beach, Florida, U.S., March 3, 2020. REUTERS/Marco Bello

Democratic U.S. presidential candidate Michael Bloomberg speaks during his Super Tuesday night rally in West Palm Beach, Florida, U.S., March 3, 2020. REUTERS/Maria Alejandra Cardona

Democratic U.S. presidential candidate Michael Bloomberg greets voters at his Super Tuesday night rally in West Palm Beach, Florida, U.S., March 3, 2020. REUTERS/Marco Bello

Democratic U.S. presidential candidate Michael Bloomberg greets supporters after speaking at his Super Tuesday night rally in West Palm Beach, Florida, U.S., March 3, 2020. REUTERS/Marco Bello

Democratic U.S. presidential candidate Michael Bloomberg greets supporters after speaking at his Super Tuesday night rally in West Palm Beach, Florida, U.S., March 3, 2020. REUTERS/Marco Bello

Democratic U.S. presidential candidate Michael Bloomberg greets supporters during his Super Tuesday night rally in West Palm Beach, Florida, U.S., March 3, 2020. REUTERS/Maria Alejandra Cardona

Democratic U.S. presidential candidate Michael Bloomberg speaks during his Super Tuesday night rally in West Palm Beach, Florida, U.S., March 3, 2020. REUTERS/Maria Alejandra Cardona

Democratic U.S. presidential candidate Michael Bloomberg leaves the stage after speaking at his Super Tuesday night rally in West Palm Beach, Florida, U.S., March 3, 2020. REUTERS/Marco Bello

Democratic U.S. presidential candidate Michael Bloomberg speaks at his Super Tuesday night rally in West Palm Beach, Florida, U.S., March 3, 2020. REUTERS/Marco Bello

Democratic U.S. presidential candidate Michael Bloomberg departs after addressing supporters at his Super Tuesday night rally in West Palm Beach, Florida, U.S., March 3, 2020. REUTERS/Marco Bello TPX IMAGES OF THE DAY

Democratic U.S. presidential candidate Michael Bloomberg speaks at his Super Tuesday night rally in West Palm Beach, Florida, U.S., March 3, 2020. REUTERS/Marco Bello

Democratic U.S. presidential candidate Michael Bloomberg speaks at his Super Tuesday night rally in West Palm Beach, Florida, U.S., March 3, 2020. REUTERS/Marco Bello

Democratic U.S. presidential candidate Michael Bloomberg attends his Super Tuesday night rally in West Palm Beach, Florida, U.S., March 3, 2020. REUTERS/Maria Alejandra Cardona

Democratic U.S. presidential candidate Michael Bloomberg speaks at his Super Tuesday night rally in West Palm Beach, Florida, U.S., March 3, 2020. REUTERS/Marco Bello

Democratic U.S. presidential candidate Michael Bloomberg speaks at his Super Tuesday night rally in West Palm Beach, Florida, U.S., March 3, 2020. REUTERS/Marco Bello

Democratic U.S. presidential candidate Michael Bloomberg speaks at his Super Tuesday night rally in West Palm Beach, Florida, U.S., March 3, 2020. REUTERS/Marco Bello

Democratic U.S. presidential candidate Michael Bloomberg addresses supporters at his Super Tuesday night rally in West Palm Beach, Florida, U.S., March 3, 2020. REUTERS/Marco Bello

Supporters of democratic U.S. presidential candidate Michael Bloomberg attend his Super Tuesday night rally in West Palm Beach, Florida, U.S., March 3, 2020. REUTERS/Maria Alejandra Cardona

Democratic U.S. presidential candidate Michael Bloomberg speaks during his Super Tuesday night rally in West Palm Beach, Florida, U.S., March 3, 2020. REUTERS/Maria Alejandra Cardona

Democratic U.S. presidential candidate Michael Bloomberg speaks during his Super Tuesday night rally in West Palm Beach, Florida, U.S., March 3, 2020. REUTERS/Maria Alejandra Cardona

Democratic U.S. presidential candidate Michael Bloomberg speaks at his Super Tuesday night rally in West Palm Beach, Florida, U.S., March 3, 2020. REUTERS/Marco Bello

Democratic U.S. presidential candidate Michael Bloomberg addresses supporters at his Super Tuesday night rally in West Palm Beach, Florida, U.S., March 3, 2020. REUTERS/Marco Bello

Democratic U.S. presidential candidate Michael Bloomberg addresses supporters at his Super Tuesday night rally in West Palm Beach, Florida, U.S., March 3, 2020. REUTERS/Marco Bello

Democratic U.S. presidential candidate Michael Bloomberg attends his Super Tuesday night rally in West Palm Beach, Florida, U.S., March 3, 2020. REUTERS/Maria Alejandra Cardona

Democratic U.S. presidential candidate Michael Bloomberg speaks at his Super Tuesday night rally in West Palm Beach, Florida, U.S., March 3, 2020. REUTERS/Marco Bello

Democratic U.S. presidential candidate Michael Bloomberg addresses supporters at his Super Tuesday night rally in West Palm Beach, Florida, U.S., March 3, 2020. REUTERS/Marco Bello

Democratic U.S. presidential candidate Michael Bloomberg greets supporters during his Super Tuesday night rally in West Palm Beach, Florida, U.S., March 3, 2020. REUTERS/Maria Alejandra Cardona

Democratic U.S. presidential candidate Michael Bloomberg speaks at his Super Tuesday night rally in West Palm Beach, Florida, U.S., March 3, 2020. REUTERS/Marco Bello

Democratic U.S. presidential candidate Michael Bloomberg addresses supporters at his Super Tuesday night rally in West Palm Beach, Florida, U.S., March 3, 2020. REUTERS/Marco Bello TPX IMAGES OF THE DAY

Democratic U.S. presidential candidate Michael Bloomberg arrives to speak at his Super Tuesday night rally in West Palm Beach, Florida, U.S., March 3, 2020. REUTERS/Marco Bello