A growing number of Democratic lawmakers are sounding the alarm about a program launched by the U.S. Department of Health and Human Services to track the spread of the coronavirus.

The public health effort, dubbed “HHS Protect Now,” hoovers up vast amounts of data, including coronavirus test results, from the Centers for Disease Control and Prevention, as well as state and local sources. It also relies on technology from secretive Silicon Valley firm Palantir, better known for working with the U.S. military, national security agencies and immigration offices.

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