New York City Mayor Bill de BlasioBill de BlasioProtesters splash red paint on NYC streets to symbolize blood De Blasio: Robert E Lee’s ‘name should be taken off everything in America, period’ House Democratic whip pushes back on calls to defund police: We need to focus on reform MORE (D) urged Sen. Elizabeth WarrenElizabeth WarrenWarren, Democrats urge Trump to back down from veto threat over changing Confederate-named bases OVERNIGHT DEFENSE: Joint Chiefs chairman says he regrets participating in Trump photo-op | GOP senators back Joint Chiefs chairman who voiced regret over Trump photo-op | Senate panel approves 0B defense policy bill Trump on collision course with Congress over bases with Confederate names MORE (D-Mass.) to endorse Sen. Bernie SandersBernie SandersThe Hill’s 12:30 Report: Milley apologizes for church photo-op Harris grapples with defund the police movement amid veep talk Biden courts younger voters — who have been a weakness MORE’s (I-Vt.) presidential campaign Tuesday, claiming Sanders would have done the same if the situation were reversed. 

Warren said she would not immediately be endorsing a candidate when she ended her campaign last week. 

“I deeply respect @ewarren. Our nation + our party is better + more progressive because of her leadership. Now our progressive movement needs her more than ever,” de Blasio tweeted Tuesday. “Senator, if the shoe were on the other foot @BernieSanders would have already endorsed you. We have.”

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De Blasio, who ended his own presidential campaign in September, endorsed Sanders last month. 

Several other former White House hopefuls have backed former Vice President Joe BidenJoe BidenHillicon Valley: Biden calls on Facebook to change political speech rules | Dems demand hearings after Georgia election chaos | Microsoft stops selling facial recognition tech to police Trump finalizing executive order calling on police to use ‘force with compassion’ The Hill’s Campaign Report: Biden campaign goes on offensive against Facebook MORE in what has become a two-person race, including former Rep. Beto O’Rourke (D-Texas), former South Bend, Ind., Mayor Pete ButtigiegPete ButtigiegScaled-back Pride Month poses challenges for fundraising, outreach Biden hopes to pick VP by Aug. 1 It’s as if a Trump operative infiltrated the Democratic primary process MORE, and Sens. Kamala HarrisKamala Devi HarrisRand Paul introduces bill to end no-knock warrants The Hill’s Campaign Report: Biden campaign goes on offensive against Facebook McEnany says Juneteenth is a very ‘meaningful’ day to Trump MORE (D-Calif.), Cory BookerCory Anthony BookerRand Paul introduces bill to end no-knock warrants Black lawmakers unveil bill to remove Confederate statues from Capitol Harris grapples with defund the police movement amid veep talk MORE (D-N.J.) and Amy KlobucharAmy KlobucharHillicon Valley: Biden calls on Facebook to change political speech rules | Dems demand hearings after Georgia election chaos | Microsoft stops selling facial recognition tech to police Democrats demand Republican leaders examine election challenges after Georgia voting chaos Harris grapples with defund the police movement amid veep talk MORE (D-Minn.). 

Biden has a lead in pledged delegates after a strong finish in South Carolina and last week’s 15 Super Tuesday races. 

Six more states are holding primary races Tuesday, including the 2020 general election battleground state of Michigan.