Sen. Barbara BoxerBarbara Levy BoxerKamala Harris on 2020 presidential bid: ‘I’m not ruling it out’ The ‘bang for the buck’ theory fueling Trump’s infrastructure plan Kamala Harris endorses Gavin Newsom for California governor MORE (D-Calif.) will introduce legislation on Tuesday to get rid of the Electoral College, after Hillary ClintonHillary Diane Rodham Clinton‘Prosperity and peace’ is the winning Republican theme for midterms Mueller recommends Papadopoulos be sentenced to up to 6 months in prison Poll: Dem opponent leads Scott Walker by 5 points MORE lost the presidential election despite leading in the popular vote. 

"In my lifetime, I have seen two elections where the winner of the general election did not win the popular vote," Boxer said in a statement. "In 2012, Donald TrumpDonald John TrumpWhite House counsel called Trump 'King Kong' behind his back: report Trump stays out of Arizona's ugly and costly GOP fight Trump claims he instructed White House counsel to cooperate with Mueller MORE tweeted, 'The electoral college is a disaster for a democracy.' I couldn't agree more. One person, one vote!"

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She added that Clinton, whom she supported, is "on track to have received more votes than any other presidential candidate in history except Barack ObamaBarack Hussein ObamaThe US must not turn its back on refugees Gorka calls Trump's comments on Mexican immigrants ‘fake news’  The queen, Aretha Franklin, is dead MORE."

"The Electoral College is an outdated, undemocratic system that does not reflect our modern society, and it needs to change immediately," she said.

Clinton is currently leading Trump by nearly a million votes, according to a Cook Political Report tracker of the national popular vote, but Trump won the Electoral College, leading the former secretary of State 290-232.

According to Pew, Clinton would be the fifth person to win the popular vote but lose the election, with the most recent being Al GoreAlbert (Al) Arnold GoreOvernight Energy: EPA questioned safety of rolling back fuel efficiency rule | Zinke blames 'environmental terrorist groups' for wildfires | Illinois sues Chicago Trump hotel for violating water rules Al Gore: Trump has had 'less of an impact on environment so far than I feared' The Hill's Morning Report — Trump to GOP: I will carry you MORE in 2000.

Boxer's legislation would amend the Constitution to abolish the Electoral College. Even if it is approved by Congress it would need to be approved by three-fourths of the states within seven years before it would take effect. 

Trump called the Electoral College "genius" on Tuesday morning, despite past criticism. 

The tweet comes after Trump said during a "60 Minutes" interview on Sunday that he still has issues with the Electoral College.

“I’m not going to change my mind just because I won,” the president-elect said. “But I would rather see it where you went with simple votes. You know, you get 100 million votes and somebody else gets 90 million votes and you win.”