The nation’s second-largest teachers union, the American Federation of Teachers (AFT), said it will encourage local and state chapters to back 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.), 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 for the 2020 Democratic nomination.

The announcement is separate from the union’s presidential endorsement, which will be made at a later date, according to a report from Politico.

“The resolution signals to members and leaders that support for any of those three candidates is welcome at this stage of the process before the union makes a national endorsement,” the union said.

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AFT President Randi Weingarten said each of the three candidates has “significant support” among the union’s 1.7 million members, citing their collective records on public education and labor rights.

“It was clear that the time to take this action was now, before all the delegates are chosen and before all of the primaries are over, so that AFT members and leaders can help shape the race and the narrative, ensure our voices are heard, and ensure one of these three candidates emerges as the nominee,” Weingarten said.

Individual AFT locals and state federations have already made endorsements in some cases, with Warren scoring the backing of both the Boston Teachers Union and the Massachusetts chapter of AFT, while the United Teachers Los Angeles, which represents about 35,00 members, has backed Sanders and the Scranton Federation of Teachers, based in Biden’s hometown, has endorsed the former vice president.

The announcement is also seen as a rejection of former New York City Mayor Mike Bloomberg, a vocal charter school proponent who frequently clashed with New York public school teachers as mayor, comparing them to the National Rifle Association in recently resurfaced remarks.