A North Dakota judge issued an arrest warrant for Green Party presidential candidate Jill Stein after she allegedly spray-painted construction equipment during a protest against the construction of a $3.8 billion oil pipeline.

Stein and her running mate Ajamu Baraka were charged Wednesday on criminal trespassing and mischief after Stein spray-painted “I approve this message” in red paint on bulldozer blade on Tuesday. Baraka is accused of painting the word “decolonization” on another piece of construction equipment, the Associated Press reported.

Stein and Baraka joined protestors from the Standing Rock Sioux tribe, who want to stop the construction of a section of the four-state oil pipeline because it may destroy cultural sites and affect the local water supply. A federal judge temporarily stopped a section of the construction after protests turned violent over the weekend.

Stein said she hoped North Dakota authorities “press charges against the real vandalism taking place at the Standing Rock Sioux reservation: the bulldozing of sacred burial sites and the unleashing of vicious attack dogs,” the AP reported.

It was not immediately clear whether Stein plans to turn herself in.

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Write to Mahita Gajanan at mahita.gajanan@time.com.