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WASHINGTON, DC - DECEMBER 07: Sen. Bernie Sanders (L) (I-VT) is greeted by Sen. Chuck Schumer (R) (D-NY) after Sanders spoke at a press conference on Medicare benefits on Capitol Hill December 7, 2016 in Washington, DC. The press conference, held by the group Social Security Works, urged U.S. President-elect Donald Trump and congressional Republicans to 'keep their hands off the American people's earned Medicare benefits.' (Photo by Win McNamee/Getty Images)

WASHINGTON, DC - DECEMBER 07:  Sen. Bernie Sanders (L) (I-VT) is greeted by Sen. Chuck Schumer (R) (D-NY) after Sanders spoke at a press conference on Medicare benefits on Capitol Hill December 7, 2016 in Washington, DC. The press conference, held by the group Social Security Works, urged U.S. President-elect Donald Trump and congressional Republicans to 'keep their hands off the American people's earned Medicare benefits.'  (Photo by Win McNamee/Getty Images)

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(From L-R) Tammy Duckworth (D) of Illinois, Senator Kristen Gillibrand (D) of New York, Senator Charles Schumer (D), Senator Bernie Sanders (I) of Vermont and Senator Patty Murray (D)of Washington State, speak at a press conference on legislation to ensure all American workers receive paid family and medical leave on March 14, 2017 in Washington, DC. / AFP PHOTO / Tasos KATOPODIS (Photo credit should read TASOS KATOPODIS/AFP/Getty Images)

(From L-R) Tammy Duckworth (D) of Illinois, Senator Kristen Gillibrand (D) of New York, Senator Charles Schumer (D), Senator Bernie Sanders (I) of Vermont and Senator Patty Murray (D)of Washington State, speak at a press conference on legislation to ensure all American workers receive paid family and medical leave on March 14, 2017 in Washington, DC. / AFP PHOTO / Tasos KATOPODIS        (Photo credit should read TASOS KATOPODIS/AFP/Getty Images)