Democratic presidential candidate and U.S. Sen. Elizabeth Warren (D-Mass.) is set to join the city’s striking teachers on the picket line Tuesday.

The senator will bring her campaign to Chicago in a visit to Oscar DePriest Elementary School at 139 S. Parkside Ave. in Austin on the West Side, her campaign said.

“I called Chicago teachers on strike to let them know I’m standing beside them,” Warren wrote on Twitter. “They’re out fighting for the future of our students—and I’m with them all the way. #PutItInWriting #FairContractNow.”

The tweet included a video of a phone call she made to a teacher that donated to her campaign. “Be strong in the Chicago teachers strike,” she says in the video “ ... I know you are out there fighting for the future of our children. ... Stay on the picket lines as long as you need to.”

American Federation of Teachers president Randi Weingarten will also be at the school.

Warren will become the second Democratic presidential candidate, after Sen. Bernie Sanders (I-Vt.), to rally with the CTU and SEIU Local 73, which represents support staff, during their contract fights.

Related Bernie Sanders rallies with Chicago teachers as strike vote gets underway

Sanders rallied and gave a speech at the union’s Near West Side headquarters last month, before the strike began.

Other Democratic presidential candidates have posted messages and videos of support on social media leading up to and throughout the work stoppage at CPS.