Rep. Ted Lieu Ted W. LieuThe spin on Woodward's tapes reveals the hypocrisy of Democrats Larry Kudlow defends response to coronavirus: Trump 'led wisely' Lieu on Trump 'playing it down' on coronavirus: 'This is reckless homicide' MORE (D-Calif.) on Monday endorsed Sen. Kamala Harris Kamala HarrisHarris honors Ginsburg, visits Supreme Court The Hill's Campaign Report: Trump and Biden vie for Minnesota | Early voting begins in four states | Blue state GOP governors back Susan Collins Kamala Harris: Black Americans have been 'disproportionately harmed' by Trump MORE (D-Calif.) for president in the 2020 election, saying she "embraces the future."

"Known Kamala for many years & worked together on various issues," Lieu tweeted. "She embraces the future, not the past, and is the person we need to move America forward."

I endorse @KamalaHarris for President.



Known Kamala for many years & worked together on various issues. She embraces the future, not the past, and is the person we need to move America forward.



Watch the #HarrisTownHall tonight at 7 pm PT / 10 pm ET to learn more about Kamala. https://t.co/P4ywl9U3Op — Ted Lieu (@tedlieu) January 28, 2019

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Lieu, who is among the most outspoken critics of President Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE, backed his home state senator over a steadily growing field of other Democratic candidates.

Harris on Sunday officially launched her bid for the presidency in 2020, kicking off her campaign with a speech in Oakland, Calif., that drew thousands of supporters. Her remarks focused on the need to unite the country and for equal access to education and health care.

While Harris did not explicitly mention Trump's name, she criticized his proposed wall along the southern border as a "medieval vanity project" and the administration's tax law, which slashed the corporate rate.

A number of Democrats have already entered the 2020 race or formed exploratory committees, including Sens. Elizabeth Warren Elizabeth WarrenBiden's fiscal program: What is the likely market impact? Warren, Schumer introduce plan for next president to cancel ,000 in student debt The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon MORE (D-Mass.) and Kirsten Gillibrand Kirsten GillibrandSunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election Suburban moms are going to decide the 2020 election Jon Stewart urges Congress to help veterans exposed to burn pits MORE (D-N.Y.), and former San Antonio Mayor Julián Castro.

The field is expected to grow in the coming months, with former Vice President Joe Biden Joe BidenMomentum growing among Republicans for Supreme Court vote before Election Day Trump expects to nominate woman to replace Ginsburg next week Video of Lindsey Graham arguing against nominating a Supreme Court justice in an election year goes viral MORE, Sen. Bernie Sanders Bernie SandersNYT editorial board remembers Ginsburg: She 'will forever have two legacies' Two GOP governors urge Republicans to hold off on Supreme Court nominee Sanders knocks McConnell: He's going against Ginsburg's 'dying wishes' MORE (I-Vt.), Sen. Cory Booker Cory Anthony BookerBipartisan praise pours in after Ginsburg's death DHS opens probe into allegations at Georgia ICE facility Democratic lawmakers call for an investigation into allegations of medical neglect at Georgia ICE facility MORE (D-N.J.) and former New York City Mayor Michael Bloomberg among those weighing a run in 2020.