Human Rights Watch has urged the two countries to ensure the safety of people crossing the dangerous migration route.
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SB4 allows Texas to detain and deport migrants. Experts say it would beckon in new era of US policy if allowed to stand.
Strict law enabling authorities to arrest migrants put on hold hours after Supreme Court allowed it to enter into force.
Biden used the divisive term in his 2024 State of the Union address, responding to Republican pressure in the audience.