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WASHINGTON, DC - JANUARY 30: Sen. Bernie Sanders (I-VT) attends a press conference at the U.S. Capitol January 30, 2019 in Washington, DC. Sanders and other members of the U.S. Senate and House of Representatives called for the reintroduction of a resolution “to end U.S. support for the Saudi-led war in Yemen” during the press conference. (Photo by Win McNamee/Getty Images)

WASHINGTON, DC - JANUARY 30:  Sen. Bernie Sanders (I-VT) attends a press conference at the U.S. Capitol January 30, 2019 in Washington, DC. Sanders and other members of the U.S. Senate and House of Representatives called for the reintroduction of a resolution “to end U.S. support for the Saudi-led war in Yemen” during the press conference. (Photo by Win McNamee/Getty Images)

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WASHINGTON, DC - OCTOBER 04: Senate Budget Committee ranking member Sen. Bernie Sanders (I-VT) attends a news conference critical of the Republican tax and budget plan at the U.S. Capitol October 4, 2017 in Washington, DC. Sanders and fellow Congressional Democrats called on President Donald Trump to keep his campaign promises to not cut entitlement programs like Social Security and Medicaid. (Photo by Chip Somodevilla/Getty Images)

WASHINGTON, DC - OCTOBER 04:  Senate Budget Committee ranking member Sen. Bernie Sanders (I-VT) attends a news conference critical of the Republican tax and budget plan at the U.S. Capitol October 4, 2017 in Washington, DC. Sanders and fellow Congressional Democrats called on President Donald Trump to keep his campaign promises to not cut entitlement programs like Social Security and Medicaid.  (Photo by Chip Somodevilla/Getty Images)

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WASHINGTON, DC - DECEMBER 13: Sen. Bernie Sanders (I-VT) listens as Republican members of the U.S. Senate and U.S. House of Representatives deliver opening statements at a Senate-House Conference Committee meeting December 13, 2017 at the U.S. Capitol in Washington, DC. The Senate-House Conference Committee met to review and reconcile tax reform legislation passed by both houses of the U.S. Congress. (Photo by Win McNamee/Getty Images)

WASHINGTON, DC - DECEMBER 13:  Sen. Bernie Sanders (I-VT) listens as Republican members of the U.S. Senate and U.S. House of Representatives deliver opening statements at a Senate-House Conference Committee meeting December 13, 2017 at the U.S. Capitol in Washington, DC.  The Senate-House Conference Committee met to review and reconcile tax reform legislation passed by both houses of the U.S. Congress.  (Photo by Win McNamee/Getty Images)

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PHILADELPHIA, PA - JULY 26: Sen. Bernie Sanders smiles while attending roll call on the second day of the Democratic National Convention at the Wells Fargo Center, July 26, 2016 in Philadelphia, Pennsylvania. An estimated 50,000 people are expected in Philadelphia, including hundreds of protesters and members of the media. The four-day Democratic National Convention kicked off July 25. (Photo by Chip Somodevilla/Getty Images)

PHILADELPHIA, PA - JULY 26:  Sen. Bernie Sanders  smiles while attending roll call on the second day of the Democratic National Convention at the Wells Fargo Center, July 26, 2016 in Philadelphia, Pennsylvania. An estimated 50,000 people are expected in Philadelphia, including hundreds of protesters and members of the media. The four-day Democratic National Convention kicked off July 25.  (Photo by Chip Somodevilla/Getty Images)

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PHILADELPHIA, PA - JULY 25: Sen. Bernie Sanders (I-VT) delivers remarks on the first day of the Democratic National Convention at the Wells Fargo Center, July 25, 2016 in Philadelphia, Pennsylvania. An estimated 50,000 people are expected in Philadelphia, including hundreds of protesters and members of the media. The four-day Democratic National Convention kicked off July 25. (Photo by Win McNamee/Getty Images)

PHILADELPHIA, PA - JULY 25:  Sen. Bernie Sanders (I-VT) delivers remarks on the first day of the Democratic National Convention at the Wells Fargo Center, July 25, 2016 in Philadelphia, Pennsylvania. An estimated 50,000 people are expected in Philadelphia, including hundreds of protesters and members of the media. The four-day Democratic National Convention kicked off July 25.  (Photo by Win McNamee/Getty Images)