Have never seen any President successfully prosecuted for violating the Hatch Act.
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No sitting U.S. president has ever been successfully prosecuted for violating the Hatch Act.
Heres why:
The Hatch Act of 1939 restricts partisan political activity by federal employees, but the President and Vice President are explicitly exempt from its provisions (5 U.S.C. § 7322 and § 7324).
The Act applies to most executive branch employees, with the U.S. Office of Special Counsel (OSC) as the enforcing authority. Penalties can include removal, demotion, or fines but not criminal prosecution.
Because the law does not cover the President, there has never been a prosecution of a sitting president for a Hatch Act violation.
However, administrations have often been accused of Hatch Act violations. For example:
Trump officials (Kellyanne Conway, Mike Pompeo, others) were cited by the OSC for repeated violations.
Obama officials (Kathleen Sebelius, Julián Castro) also received Hatch Act warnings.
But again these do not apply to the president himself.