As a presidential candidate, Joe Biden promised a more humane approach to migration on the US-Mexico border. But right now, more than 17,000 unaccompanied children are being held in migration facilities. Ros Atkins considers the challenge facing the Biden administration (Photo: Dareli Matamoros, a girl from Honduras, holds a sign asking President Biden to let her in during a migrant demonstration demanding clearer United States migration policies.

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