Donald Trump Jr. Don John Trump'Tiger King' star Joe Exotic requests pardon from Trump: 'Be my hero please' Zaid Jilani discusses Trump's move to cancel racial sensitivity training at federal agencies Trump International Hotel in Vancouver closes permanently MORE mocked Democratic 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 Friday over a decades-old admission of domestic violence after the senator criticized a member of the White House staff.

In a tweet, the president's son brought up Carper's 1998 admission that he once slapped his wife, leaving her with "some discoloration of her left eye," according to a deposition reported by the conservative The Washington Free Beacon. The incident was reported in a 1982 New York Post article that claimed his wife's two children from a previous relationship "were slapped around and bruised by Carper for doing such things as leaving the family dog on the bed."

Carper said late last year that he never lied about the incident in his 1982 bid for the House, but he did admit to slapping his wife.

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"You admitted to hitting your wife so hard it gave her a black eye!" Trump Jr. wrote.

"Maybe you shouldn’t be so worried about someone mistakenly putting #maga in a tweet??? Seems you have other serious issues to work out," he added of the nearly four-decades-old incident, for which Carper has apologized.

You admitted to hitting your wife so hard it gave her a black eye!



Maybe you shouldn’t be so worried about someone mistakenly putting #maga in a tweet???



Seems you have other serious issues to work out. https://t.co/PJ7rivgILa — Donald Trump Jr. (@DonaldJTrumpJr) September 20, 2018

Carper has repeatedly apologized for the incident, including in December after a Free Beacon report accused him of lying about the incident during his 1982 bid for the House.

"I have made many mistakes in my life and have always been willing to admit them. One of those mistakes took place 37 years ago when I slapped my then-wife, Diane, during a heated argument," Carper said last year.

"It was wrong. I regretted it then, and I still do today," he added.

Trump Jr.'s tweet came in response to Carper's criticism on Thursday of first lady 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, Stephanie Grisham. In a letter sent to Carper, the Office of the Special Counsel (OSC) warned Grisham for a tweet found to be in violation the Hatch Act.

The Hatch Act prohibits government employees from using their official capacities to endorse or campaign for a candidate seeking office. Several members of the administration, 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 for past violations.

"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 Thursday. Carper's office had raised the allegations with the special counsel.

"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.