WASHINGTON (AP) — The Department of Government Efficiency, run by President Donald Trump’s billionaire adviser and Tesla CEO Elon Musk, has gained access to sensitive Treasury data including Social Security and Medicare customer payment systems, according to two people familiar with the situation.

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The highest-ranking Democrat on the Senate Finance Committee, Ron Wyden of Oregon, on Friday sent a letter to Trump’s Treasury Secretary Scott Bessent expressing concern that “officials associated with Musk may have intended to access these payment systems to illegally withhold payments to any number of programs.”