For the first time in history, more than two million migrants have been detained at the Mexican border in a single year.
U.S. Customs and Border Protection arrested 203,598 migrants entering the country from Mexico in August.
The overall arrests considerably surpass the previous high set last year of more than 1.7 million.
High numbers of migrants crossing from outside of Mexico and Central America have contributed to this year's extraordinary migration wave.
The final tally won't be made public until until September 30th, when the fiscal year ends.
Political unrest makes it more difficult for the U.S. to send migrants back to those host nations.
Despite President Joe Biden's calls for sweeping immigration reforms, no legislation has been passed.