Democrat Senator Ron Wyden is demanding Department of Homeland Security probe a surveillance program allowing secret collection of 200 million domestic and international money transfers.
The Immigration Customs Enforcement data collection included tracking transfers over $500 between Mexico and the U.S. as well as the states of Arizona, California, New Mexico and Texas.
The program allowed surveillance without a warrant and stated in 2010 after a settlement between Western Union and the Attorney General's office in Arizona.
Dozens of money-transfer service voluntarily handed over data for the program.
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