Interior Secretary Ryan Zinke Ryan Keith ZinkeTrump extends Florida offshore drilling pause, expands it to Georgia, South Carolina Conspicuous by their absence from the Republican Convention Trump flails as audience dwindles and ratings plummet MORE has apologized and deleted a tweet that may have broken federal ethics laws prohibiting government officials from engaging in political activity.

The tweet showed Zinke wearing a pair of socks with 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 face on them Tuesday while attending a meeting of the Western Governors Association at Mount Rushmore in South Dakota, according to Reuters. The socks also had the Trump campaign's “Make America Great Again” campaign slogan on them.

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“Breaking in new socks on a hike with the governors today,” the official @SecretaryZinke Twitter account said in a now-deleted tweet.

.@SecretaryZinke deleted this tweet, a clear violation of the Hatch Act. pic.twitter.com/qILMnXSDOg — Accountability (@Accountable_Org) June 26, 2018

Zinke apologized for the tweet, which was deleted, on his official account later on Tuesday.

“Earlier I tweeted a pic of my new socks not realizing it had what could be viewed as a political slogan. I’ve deleted it and apologize for the mistake. I remain excited about all the incredible policy work POTUS is doing,” the tweet said, with the campaign slogan blacked out in the photo.

The Campaign for Accountability, a nonpartisan public accountability group, filed a complaint on Wednesday with the U.S. Office of the Special Counsel calling for an investigation and claiming Zinke's tweet violated the Hatch Act, which prohibits political activity by government officials on the job.

“Secretary Zinke continues to play fast and loose with federal ethics laws,” Executive Director Daniel Stevens said in a statement. “The Secretary of the Interior should know better than to promote a campaign slogan while touring a national park. The Office of Special Counsel should investigate Secretary Zinke’s conduct and sanction him for violating the Hatch Act.”

The watchdog also shared a March 2018 memo from the Office of Special Counsel, an independent investigative office that has oversight on the Hatch Act and is separate from the Russia probe led by special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE, stating that Trump’s “Make America Great Again” slogan or nonofficial pictures of Trump may not be displayed or worn.

Another member of Trump’s administration was found to have been in violation of the Hatch Act earlier this year.

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 violated the Hatch Act on two separate occasions by endorsing and advocating political candidates while appearing in her official capacity.