US lawmakers in Congress have listened to the testimony of a Guatemalan mother whose toddler died of a viral lung infection while in an immigration detention site in the United States.

Several children have already died while in custody at these detention centres.

Democrats who accuse the immigration officials of treating the migrant children poorly were visibly moved at her story. But one Republican representative defended their behaviour.

Al Jazeera's John Hendren reports from Washington, DC.

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