The Rev. Jesse Jackson endorsed Hillary Clinton Hillary Diane Rodham ClintonJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Momentum growing among Republicans for Supreme Court vote before Election Day Warning signs flash for Lindsey Graham in South Carolina MORE for president Saturday and said he trusts her to tackle important issues.

Jackson, who was a Democratic presidential candidate in 1984 and 1988, held a press conference in Chicago to make the announcement Saturday afternoon.

"We trust her to work on health care, to fight for the poor ... for the willingness to fight for civil rights," Jackson said.

On matters of human & voting rights,racial&gender equality& affordable healthcare you can trust her. @HillaryClinton pic.twitter.com/s0N7x7TRuf — Rev Jesse Jackson Sr (@RevJJackson) June 11, 2016

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The civil rights icon previously said his long history of working with both Clinton and rival Bernie Sanders Bernie SandersNYT editorial board remembers Ginsburg: She 'will forever have two legacies' Two GOP governors urge Republicans to hold off on Supreme Court nominee Sanders knocks McConnell: He's going against Ginsburg's 'dying wishes' MORE prevented him from endorsing until the party's nominee was named.

Jackson endorsed then-Sen. Barack Obama Barack Hussein ObamaMomentum growing among Republicans for Supreme Court vote before Election Day Warning signs flash for Lindsey Graham in South Carolina Majority of voters say Trump should not nominate a Supreme Court justice: poll MORE for president over Clinton in 2008.

He and the former secretary of State worked together decades ago to fight poverty in Mississippi and again when she teamed up with Marian Wright Edelman to tackle children's healthcare issues.

He also coordinated with Sanders on efforts to regulate Wall Street, and Sanders endorsed Jackson's presidential bids in the 1980s.

Jackson now heads the Rainbow PUSH Coalition, a non-profit organization that pursues social justice, civil rights and political activism.