President Donald Trump says he's instructed Homeland Security Secretary Kristi Noem not to intervene in protests in Democratic-led cities unless local authorities request federal help. On his social media site Saturday, Trump posted that federal authorities will not participate in protests or riots, unless asked. He did not provide details on how such an order would affect immigration enforcement operations going forward but emphasized protecting federal buildings. The Trump administration has already deployed forces in several Democratic areas. Opposition to these tactics has grown, especially in Minnesota, where protests erupted after federal officers fatally shot two people in Minneapolis.