As the Chicago's Teacher's Union announced plans Wednesday for a one-day strike on April 1, Democratic presidential hopeful Bernie Sanders took to Twitter to pledge his support for the group.

"I stand with Chicago teachers," Sanders tweeted. "We shouldn't close schools and lay off teachers to reward Wall Street."

A flyer on the union's website urged Chicagoans to "join families, teachers, workers and all those who thirst for justice" in an effort to "shut it down" on April 1.

The flyer features photos of Gov. Bruce Rauner, Mayor Rahm Emanuel and billionaire Ken Griffin and touches on four main points: corporate welfare, tax injustice, growing poverty and racial justice.

Sanders is in a highly-contested race with former Secretary of State Hillary Clinton for the Democratic presidential nomination.

He will host a rally Friday at Argo Community High School in suburban Summit.

Clinton currently leads Sanders in pledged delegates, 760 to 546. Clinton took Mississippi Tuesday, with Sanders taking Michigan.

According to a recent Capitol Fax/We Ask America poll, Clinton holds a commanding lead over Sanders among Illinois voters. The poll, which surveyed 994 likely voters and was taken Monday, shows Clinton receiving 63 percent of support and Sanders receiving 25 percent.

The candidates will face off in Illinois’ March 15 Democratic presidential primary.