Sen. Ron Wyden, D-Ore., is calling on the Department of Homeland Security to cease what he describes as an illegal abuse of customs law to reveal the identities of social media accounts tracking the activity of ICE agents, according to a letter shared with The Intercept.

This case hinges on a recent effort by the Trump administration to unmask Instagram and Facebook accounts monitoring immigration agents in Montgomery County, Pennsylvania. It’s not the first effort of its kind by federal authorities.

In 2017, The Intercept reported an attempt by U.S. Customs and Border Protection to reveal the identity of the operator of a Twitter account critical of President Donald Trump by invoking, without explanation, its legal authority to investigate the collection of tariffs and import duties.

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