White House hopeful Sen. Bernie Sanders Bernie SandersSirota reacts to report of harassment, doxing by Harris supporters Republicans not immune to the malady that hobbled Democrats The Hill's Morning Report - Sponsored by Facebook - Republicans lawmakers rebuke Trump on election MORE (I-Vt.) will join striking teachers and auto workers in the Midwest next week as the Democratic presidential candidate seeks to gin up support for his campaign among working-class voters.

Sanders, who has long cast himself as an ally of unions and other labor groups, will join teachers striking in Chicago on Tuesday and then travel to Detroit to picket with auto workers with the United Auto Workers union striking against General Motors.

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“Throughout the campaign, Sanders has stood on multiple picket lines with workers and has used his email and text lists to urge his supporters to stand with striking workers across the country. In August, he released his Workplace Democracy Plan, which would double union membership during his term and give workers unprecedented protections in the workplace,” his campaign said in a statement.

The move comes as Sanders works to shore up his support among working-class voters as he tries to face down a rising challenge from Sen. Elizabeth Warren Elizabeth WarrenOvernight Defense: Appeals court revives House lawsuit against military funding for border wall | Dems push for limits on transferring military gear to police | Lawmakers ask for IG probe into Pentagon's use of COVID-19 funds On The Money: Half of states deplete funds for Trump's 0 unemployment expansion | EU appealing ruling in Apple tax case | House Democrats include more aid for airlines in coronavirus package Warren, Khanna request IG investigation into Pentagon's use of coronavirus funds MORE (D-Mass.) for the primary field’s progressive mantle.

Polling has shown a tightening margin between the two senators, with Warren leapfrogging Sanders in the Real Clear Politics polling index. Both continue to trail former Vice President Joe Biden Joe BidenFormer Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick Bloomberg rolls out M ad buy to boost Biden in Florida MORE in polls of the Democratic race.

Several other 2020 contenders are also jockeying for support among working-class voters as the party as a whole works to win back blue collar workers who historically backed Democrats but flipped to President Trump in 2016.