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Democratic presidential candidate former Vice President Joe Biden speaks at a primary election night campaign rally Tuesday, March 3, 2020, in Los Angeles. (AP Photo/Chris Carlson)

President Donald Trump with Department of Health and Human Services Secretary Alex Azar, back center, and Director of the National Institute of Allergy and Infectious Diseases at the National Institutes of Health Anthony Fauci, right, and other members of the president's coronavirus task force speaks during a news conference at the Brady press briefing room of the White House, Wednesday, Feb. 26, 2020, in Washington. (AP Photo/Manuel Balce Ceneta)

Roger Stone, center, puts his hat on as he departs after his sentencing at federal court in Washington, Thursday, Feb. 20, 2020. President Donald Trump loyalist and ally, Roger Stone was sentenced to over three years in federal prison, following an extraordinary move by Attorney General William Barr to back off his Justice Department's original sentencing recommendation. The sentence came amid President Donald Trump's unrelenting defense of his longtime confidant that led to a mini-revolt inside the Justice Department and allegations the president interfered in the case. (AP Photo/Alex Brandon)

Democratic presidential candidate Mike Bloomberg gives his thumbs-up after speaking during a campaign event at Hardywood Park Craft Brewery in Richmond, Va., Saturday, Feb. 15, 2020. (James H. Wallace/Richmond Times-Dispatch via AP)

Democratic presidential candidate and former New York City Mayor Michael Bloomberg is joined on stage by supporters during his campaign launch of "Mike for Black America," at the Buffalo Soldiers National Museum, Thursday, Feb. 13, 2020, in Houston. (AP Photo/David J. Phillip)

FILE - In this Feb. 1, 2019 file photo, former campaign adviser for President Donald Trump, Roger Stone, leaves federal court in Washington. The Justice Department said Tuesday it will take the extraordinary step of lowering the amount of prison time it will seek for Roger Stone, an announcement that came just hours after President Donald Trump complained that the recommended sentence for his longtime ally and confidant was “very horrible and unfair." (AP Photo/Pablo Martinez Monsivais)

FILE - In this June 7, 2017, file photo, then FBI Acting Director Andrew McCabe listens during a Senate Intelligence Committee hearing on Capitol Hill in Washington. (AP Photo/Alex Brandon, File)

FILE - In this March 29, 2018 file photo, President Donald Trump poses for members of the media with then White House Communications Director Hope Hicks on her last day before he boards Marine One on the South Lawn of the White House in Washington. Hicks, one of President Donald Trump's most trusted and longest-serving aides, is returning to the White House. Hicks will be serving as counselor to the president, working with presidential son-in-law and senior adviser Jared Kushner. (AP Photo/Andrew Harnik)

President Donald Trump speaks during a meeting with Ecuadorian President Lenin Moreno in the Oval Office of the White House, Wednesday, Feb. 12, 2020, in Washington. (AP Photo/Evan Vucci)

British lawmaker Sajid Javid Chancellor of the Exchequer walks along Downing Street in London, Thursday, Feb. 13, 2020. British Prime Minister Boris Johnson shook up his government on Thursday, firing and appointing ministers to key Cabinet posts. Johnson was aiming to tighten his grip on government after winning a big parliamentary majority in December's election. That victory allowed Johnson to take Britain out of the European Union in January. (AP Photo/Matt Dunham)