Green Party Presidential candidate Jill Stein faces charges after being arrested during the protest at the Dakota Access Pipeline construction site, south of Mandan.
Stein is a clean energy advocate.
Stein reportedly used spray paint – to leave a message on one piece of heavy equipment on-site. It read “I Approve This Message.”
Morton County Sheriff Kyle Kirschmeier said charges are pending.
"We are working up the information through the state's attorney's office to pursue charges," Kirschmeier told a Mandan news conference. "One is trespassing, and also vandalism."
Stein camped with protestors Monday night.