Across the country, protesters rallied on Thursday under a shared refrain inspired by former congressman and civil rights icon John Lewis: “Good trouble lives on.” Thousands of people took to the streets in what organizers cast as a national day of action — a sweeping protest of the Trump administration’s cuts to safety net programs and efforts to roll back protections for immigrants and marginalized communities.

Protests and events against President Donald Trump’s controversial policies that include mass deportations and cuts to Medicaid and other safety nets for poor people are planned Thursday at more than ...