Chants of "lock her up" erupted at the Conservative Political Action Conference (CPAC) on Thursday after a speaker mentioned former Democratic presidential nominee 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.

"She's already in a jail of her own making somewhere in the woods in upstate New York," conservative commentator Ben Shapiro said in response to the chants.

The "lock her up" chant was frequently heard at President Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE's rallies throughout the 2016 presidential campaign and became something of a rallying cry for some of his supporters.

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Trump's former national security adviser Michael Flynn, then serving as a surrogate for the GOP candidate's campaign, joined the crowd at the Republican National Convention in 2016 calling to "lock her up."

"Lock her up, that’s right,” Flynn said. “If I did a tenth of what she did, I would be in jail today."

The chants have also taken place at rallies that Trump has held since becoming president.

Trump memorably told a crowd at a campaign rally last year that they’d have to “speak to [Attorney General] Jeff Sessions Jefferson (Jeff) Beauregard SessionsTrump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status White House officials voted by show of hands on 2018 family separations: report MORE” after the crowd chanted “lock her up” in response to a reference to Clinton.

During the 2016 campaign, Trump called for a special prosecutor to investigate Clinton's use of a private email server when she served as secretary of State, telling her during a debate that she "would be in jail" if he was president.