The Office of Special Counsel (OSC) warned Melania Trump Melania TrumpTrump privately blamed Black Americans for lacking initiative: report The Hill's 12:30 Report: Ginsburg lies in repose Melania Trump: Ginsburg's 'spirit will live on in all she has inspired' MORE's spokeswoman over a tweet found to be in violation of the Hatch Act, according to a letter sent to a Democratic senator.

Sen. Tom Carper Thomas (Tom) Richard CarperThe conservative case for phasing out hydrofluorocarbons Democrat asks for probe of EPA's use of politically appointed lawyers Overnight Energy: Study links coronavirus mortality to air pollution exposure | Low-income, minority households pay more for utilities: report MORE (D-Del.) on Thursday tweeted images of a letter he received from the OSC in which the agency responds to an allegation from his office that Stephanie Grisham, the first lady's longtime spokeswoman, violated the Hatch Act with a tweet containing the acronym for President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE's campaign slogan.

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Grisham, as a White House staffer, is prohibited from using her government position, including the Twitter account she operates in her capacity as spokeswoman, to advocate for political candidates. The president, OSC said, falls under than umbrella.

The OSC said it issued a warning to Grisham, according to the letter sent to Carper, who called news of Grisham's violation "astounding."

He also ripped the administration's "repeated" violations of the law.

"Two months after my inquiry, the @US_OSC has confirmed that yet another Trump White House staffer has violated the Hatch Act. This administration's blatant and repeated disregard for the law is astounding and unacceptable," Carper tweeted.

"At the very least, we should be able to trust that those who serve in the highest positions in our government will follow the law. Instead, this administration seems to promote a culture where showing that basic level of respect for the American taxpayer is optional," he added.

NEWS: Two months after my inquiry, the @US_OSC has confirmed that yet another Trump White House staffer has violated the Hatch Act. This administration's blatant and repeated disregard for the law is astounding and unacceptable. https://t.co/XEXFsTWU9M — Senator Tom Carper (@SenatorCarper) September 20, 2018

A number of Trump administration officials, including White House counselor Kellyanne Conway Kellyanne Elizabeth ConwaySpecial counsel investigating DeVos for potential Hatch Act violation: report George and Kellyanne Conway honor Ginsburg Trump carries on with rally, unaware of Ginsburg's death MORE and U.S. Ambassador to the United Nations Nikki Haley Nimrata (Nikki) Haley'The soul' versus 'law and order' Author Ryan Girdusky: RNC worked best when highlighting 'regular people' as opposed to 'standard Republicans' GOP lobbyists pleasantly surprised by Republican convention MORE, have been cited by the OSC in the past for violations of the law, but no punishments have been levied by the White House.

Authority to punish Hatch Act violations falls to the president. The OSC does not have the power to take action other than informing the White House of violations.