The push to block ICE's plans to expand detention centers is fueling a coordinated national day of protests on Saturday. Why it matters: No Kings protests have shown an appetite among Americans to unify against some Trump administration policies, and the latest effort — organized by the Disappeared in America campaign — is building on that momentum. Organizers tell Axios that one of the most mentioned reasons demonstrators attended the No Kings protests was their opposition to immigration enforcement, and Saturday's Communities Not Cages events expect to harness that energy. Key protester demands include making the administration cancel warehouse detention plans and encouraging communities to reject any public funding, approvals, or local resources for expanding detention of migrants. They're also calling for transparency and community consent before any detention-related plans proceed.…