President Joe Biden is dispatching top officials to Mexico and Central America as the crisis on the southern U.S. border persists with a surge of asylum-seeking migrants who are fleeing their countries.

The crisis at the border has created a difficult situation for Biden, who is caught between his promises to progressives to establish a more humane immigration system and pressure from conservatives to send a tougher message to deter migrants from traveling to the U.S. to seek asylum. The influx has overwhelmed border facilities and driven the national conversation on immigration.

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