One of the leading Democratic presidential hopefuls in the U.S. said he is very concerned about the “coup” in Bolivia.

Bernie Sanders, who has a long record of opposing military interventions and coups across the world, urged U.S. to support Bolivia’s democratic institutions late Monday.

“I am very concerned about what appears to be a coup in Bolivia, where the military, after weeks of political unrest, intervened to remove President Evo Morales. The U.S. must call for an end to violence and support Bolivia’s democratic institutions,” Sanders said on Twitter.

Read more: US: Democratic forerunner concerned over Bolivia ‘coup’