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STORY: U.S. Border Patrol agents have been processing migrants from all over the world who were waiting between the two metal border barriers on the southern border, in scenes reminiscent of the large numbers of migrants who gathered there in May.

U.S. border authorities encountered more than 142,000 migrants at the U.S.-Mexico border in the first half of September, according to data shared by Mexico's president, a tally on pace to match or even surpass previous monthly highs.

The dramatic increase along the border - notably in San Diego, California, and the Texan cities of El Paso and Eagle Pass - marks a turning point after numbers had plummeted in recent months, and could create fresh political challenges for U.S. President Joe Biden heading into election season.