Story highlights Stein and her running mate, Ajamu Baraka, have been charged with criminal trespass and criminal mischief

Stein admitted in a statement to spray-painting a bulldozer

(CNN) A North Dakota sheriff's office pressed charges against Jill Stein Wednesday after the Green Party presidential nominee spray-painted a bulldozer during an environmental protest.

The Morton County Sheriff's Department said on its Facebook page that both Stein and her running mate, Ajamu Baraka, have been charged with criminal trespass and criminal mischief, both misdemeanors. The office also says it has video of the event.

Stein, who was not arrested at Tuesday's protest, admitted in a statement to spray-painting the bulldozer during the anti-oil demonstration, which concerned construction that she said amounted to desecrating Native American burial sites.

The bulldozer now has the phrase "I approve this message" emblazoned in red across its blade.

Footage of her shaking a can before painting her message onto the bulldozer at the site in St. Anthony could be seen in local media on Tuesday as well.

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