Sen. 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.) is expected to withhold endorsing either remaining Democratic presidential candidates before the primary ends, The New York Times reported Wednesday, citing several people close to Warren.

Warren will likely not endorse either Sen. Bernie Sanders Bernie SandersKenosha will be a good bellwether in 2020 Biden's fiscal program: What is the likely market impact? McConnell accuses Democrats of sowing division by 'downplaying progress' on election security MORE (I-Vt.) or former Vice President Joe Biden Joe BidenSenate Republicans face tough decision on replacing Ginsburg What Senate Republicans have said about election-year Supreme Court vacancies Biden says Ginsburg successor should be picked by candidate who wins on Nov. 3 MORE before one is named the party nominee, according to the Times.

The Massachusetts senator ended her own presidential campaign shortly last week after failing to win in the early voting states. She said she would not immediately be endorsing a candidate.

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Sanders’s platform is more similar to the progressive agenda Warren was pitching in her campaign. Biden, however, is building on his lead over Sanders after big wins in Tuesday night’s election following momentum he built after winning South Carolina and 10 out of 14 Super Tuesday states.

Warren has spoken with Biden once since Super Tuesday and has spoken with Sanders multiple times, the Times reported.

Some of Sanders’s supporters have been urging Warren to endorse Sanders, noting how the two have similar progressive policies.

New York City Mayor Bill de Blasio Bill de BlasioNew York again pushes back in-person classes The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Trump contradicts CDC director on vaccine, masks De Blasio to furlough himself, 494 other staff members amid financial crunch: report MORE (D), who endorsed Sanders after ending his own long-shot presidential campaign, called on Warren to back Sanders on Tuesday.

“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. “Senator, if the shoe were on the other foot @BernieSanders would have already endorsed you. Please join us!”

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I deeply respect @ewarren. Our nation + our party are better + more progressive because of her leadership. Now our progressive movement needs her more than ever. Senator, if the shoe was on the other foot @BernieSanders would have endorsed you already. Please join us! — Bill de Blasio (@BilldeBlasio) March 10, 2020

Rep. Alexandria Ocasio-Cortez Alexandria Ocasio-CortezLawmakers fear voter backlash over failure to reach COVID-19 relief deal Why Democrats must confront extreme left wing incitement to violence The Hill Interview: Jerry Brown on climate disasters, COVID-19 and Biden's 'Rooseveltian moment' MORE (D-N.Y), one of Sanders’s most high-profile surrogates, told the Times she understood Warren’s hesitation.

“I always want to see us come together as a progressive wing,” Ocasio-Cortez said. “I think that’s important and where we draw strength from.

"But at the same time, I come from the lens of an organizer," she continued. "And if someone doesn’t do what you want, you don’t blame them — you ask why. And you don’t demand that answer of that person — you reflect. And that reflection is where you can grow.”

Biden grew his delegate lead to about 150 over Sanders after wins in Mississippi, Missouri, Michigan and Idaho Tuesday night.

Sanders vowed Wednesday to continue his campaign despite his string of losses.