Former White House chief strategist Stephen Bannon on Wednesday reportedly lashed out at 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 during a speech at a Republican fundraiser in Michigan, prompting chants of “lock her up” from the crowd.

“I knew we’d come to a ‘unity dinner’ and a Trump rally would break out,” Bannon said, according to multiple reporters on the scene.

Bannon reportedly criticized Clinton for "her journey into identity politics."

“Lock her up! Lock her up!" chants several dozen at GOP dinner in Michigan. Steve Bannon stops and chuckles: "I know we’d come to a 'unity dinner' and a Trump rally would break out." — Vaughn Hillyard (@VaughnHillyard) November 9, 2017

A "lock her up" chant just broke out during Bannon's speech in Michigan #2016forever — Rosie Gray (@RosieGray) November 9, 2017

"Lock her up" chants start as Bannon mentions Hillary Clinton. Protesters changed "lock him up" earlier outside, referencing Trump — Jonathan Oosting (@jonathanoosting) November 9, 2017

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Bannon, who also advised President Trump during the campaign, headlined an event Wednesday for the Macomb County GOP in Michigan. The state was crucial in securing Trump's victory in the Electoral College one year ago. Macomb County went to Trump and Vice President Pence by nearly 50,000 thousand votes.

During the 2016 campaign, Trump and his allies frequently called for Clinton to be prosecuted for her actions as secretary of State. Trump has continued to suggest the Justice Department should investigate his former political opponent, drawing criticism from other lawmakers.

The chant "lock her up" was popular at Trump rallies during the campaign and has reemerged at Trump rallies since he took the White House.

Bannon left the White House in August and returned to Breitbart News, where he is chairman. He remains active in political campaigns and has pledged to fight the GOP establishment.