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President Joe Biden, right, and Sen. Bernie Sanders, I-Vt., walk from Marine One upon arrival on the South Lawn of the White House, Monday, April 22, 2024, in Washington.(AP Photo/Alex Brandon)
President Joe Biden, right, and Sen. Bernie Sanders, I-Vt., walk from Marine One upon arrival on the South Lawn of the White House, Monday, April 22, 2024, in Washington. (AP Photo/Alex Brandon)
Sen. Bernie Sanders, I-Vt., left, walks with President Joe Biden to the Oval Office of the White House, Monday, April 22, 2024, in Washington. (AP Photo/Alex Brandon)
FILE - Former Vice President Joe Biden, left, embraces Sen. Bernie Sanders, I-Vt., during a Democratic presidential primary debate, Feb. 7, 2020, hosted by ABC News, Apple News, and WMUR-TV at Saint Anselm College in Manchester, N.H. (AP Photo/Elise Amendola, File)
FILE - Former Vice President Joe Biden, left, and Sen. Bernie Sanders, I-Vt., right, greet one another before they participate in a Democratic presidential primary debate at CNN Studios in Washington, March 15, 2020. (AP Photo/Evan Vucci, File)
FILE - Democratic presidential candidates former Vice President Joe Biden, left, and Sen. Bernie Sanders, I-Vt., speak during a Democratic presidential primary debate Thursday, Dec. 19, 2019, in Los Angeles. (AP Photo/Chris Carlson, File)
FILE - President Joe Biden greets Sen. Bernie Sanders, I-Vt., as Biden arrives to speak to a joint session of Congress in the House Chamber at the U.S. Capitol in Washington, on April 29, 2021. (AP Photo/Andrew Harnik, Pool)
FILE - Democratic presidential candidates, Sen. Bernie Sanders, I-Vt., left, and former Vice President Joe Biden, talk before a Democratic presidential primary debate in Charleston, S.C., on Feb. 25, 2020. (AP Photo/Matt Rourke, File)
President Joe Biden speaks with Sen. Bernie Sanders, I-Vt., after addressing a joint session of congress in the House chamber of the U.S. Capitol on April 28, 2021 in Washington. (Chip Somodevilla/Pool via AP)
FILE - President Joe Biden stands with Sen. Bernie Sanders, I-Vt., after speaking about lowering health care costs in the Indian Treaty Room at the Eisenhower Executive Office Building on the White House complex in Washington, Wednesday, April 3, 2024. (AP Photo/Mark Schiefelbein)
President Joe Biden speaks with Sen. Bernie Sanders, I-Vt., left, after addressing a joint session of congress in the House chamber of the U.S. Capitol on April 28, 2021, in Washington, (Chip Somodevilla/Pool via AP
FILE - Senate Majority Leader Chuck Schumer, D-N.Y., talks with Sen. Patrick Leahy, D-Vt., Sen. Dick Durbin, D-Ill., Sen. Bernie Sanders, I-Vt., and other members of Congress before President Joe Biden arrives to deliver his first address to a joint session of the U.S. Congress inside the House Chamber of the U.S. Capitol in Washington, on April 28, 2021. (Jonathan Ernst/Pool via AP)
FILE - Former Vice President Joe Biden, left, and Sen. Bernie Sanders, I-Vt., right, participate in a Democratic presidential primary debate at CNN Studios in Washington, March 15, 2020. (AP Photo/Evan Vucci, File)