President Trump Donald John TrumpBarr criticizes DOJ in speech declaring all agency power 'is invested in the attorney general' Military leaders asked about using heat ray on protesters outside White House: report Powell warns failure to reach COVID-19 deal could 'scar and damage' economy MORE’s son Donald Trump Jr. on Sunday shared a picture of himself on Instagram holding an AR-15-style rifle featuring a magazine with an illustration of former Democratic presidential nominee Hillary Clinton Hillary Diane Rodham ClintonBarr criticizes DOJ in speech declaring all agency power 'is invested in the attorney general' Virginia Democrat blasts Trump's 'appalling' remark about COVID-19 deaths in 'blue states' The Hill's Campaign Report: Biden asks if public can trust vaccine from Trump ahead of Election Day | Oklahoma health officials raised red flags before Trump rally MORE behind bars.

“Nice day at the range. @rarebreedfirearms and @spikes_tactical adding a little extra awesome to my AR and that mag,” Trump Jr. said in a post about his rifle and the magazine, an apparent reference to the frequent "lock her up" chants that erupt at Trump campaign rallies.

The rifle was also adorned with a cross symbol used during the Crusades. The Instagram post featured a variety of pictures of the AR-15 style rifle, which was made by Texas-based Rare Breed Firearms and named the Crusader. It remains unclear if Trump Jr. owns the weapon.

In response to some backlash online, a spokesperson for Trump Jr. told The Hill that the "Instagram post was strictly about him using a famous meme to mock Hillary Clinton, as he and many others have done on numerous occasions and will surely do again in the future, so long as it continues triggering humorless liberals."

The Washington Post noted that Rare Breed Firearms appeared to create the design featured on the lower receiver Trump Jr. is pictured holding. Spike’s Tactical distributes lower receivers featuring the cross symbol. It also sells magazines featuring the cartoon of Clinton behind bars for $20 on its website.

Following Trump Jr.'s Instagram post, the company said in a post of its own that it was receiving "lots of questions" about the Clinton cartoon magazine.

"Head over to our website and get yours. They’re going fast," the company said.

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Spike's Tactical did not immediately respond to a request for comment from The Hill.

Clinton has remained a frequent target of Trump and his allies in the years following his surprise victory. Trump continues to rail against her at campaign rallies, often leading to loud chants of "lock her up."

Trump Jr. also targeted Clinton in the dedication of his recently published book, “Triggered," dedicating it to the "deplorables," a reference to Clinton's comment during the 2016 campaign about Trump supporters.