Prince Harry loses case with which he sought to hire private security 0:43

Prince Harry's immigration files should be declassified in light of revelations about drug use in his recent book, a conservative think tank will argue in federal court next week.

The Heritage Foundation has sued the U.S. government to find out if it acted in accordance with procedure when it granted the Duke of Sussex a U.S. visa. Under U.S. immigration law, past drug testing can be grounds for rejecting an application.

The case will be brought before a federal judge on June 6 in the U.S. District Court for the District of Columbia.

The organization filed a Freedom of Information Act lawsuit, seeking to force the government to make Harry's immigration file public. "The information requested is in the immense public interest," reads an amended lawsuit filed May 5.

"Extensive and ongoing media coverage has brought to light the question of whether DHS properly admitted the Duke of Sussex in light of the fact that he has publicly admitted to a number of drug offenses both in the United States and abroad." Continues.

• Nine shocking revelations from Prince Harry's biography "Spare"

The original request for Harry's files was rejected because Harry had not indicated that he "consented to the release of his information," the U.S. Justice Department said in court documents.

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In addition, DHS argues that "citations to speculation about the status of Prince Harry's visa are not sufficient to meet the standard" of speeding up the process of publishing the document.

The Heritage Foundation has long been one of Washington's most influential conservative think tanks. Nile Gardiner, director of the foundation's Margaret Thatcher Center for Freedom, tweeted Thursday that there was public interest in releasing Harry's background.

"Given their widespread admission of drug use, normally disqualifying for entry into the United States, the American people deserve answers to the serious questions the evidence raises," he wrote in a Twitter message. "Did DHS in fact look the other way, did it have favorites, or did it not adequately respond to any possible false statements by Prince Harry?"

CNN asked a representative for Prince Harry for comment.

Harry recently confessed to using several recreational drugs at parties in his explosive memoir "Spare," published in January.

The Duke of Sussex has admitted to using cocaine, smoking marijuana and trying hallucinogenic mushrooms. Harry, who moved to California with Meghan in 2020, has opened up about his experiences with cocaine as a teenager.

"Of course. He had been using cocaine around the time. At someone's cottage, during a weekend of shooting, I had been offered a line, and I had taken a few more since then," Harry revealed.

"It wasn't much fun, and it didn't make me especially happy, as it seemed to do to everyone around me; But it made me feel different and that was the main goal."

Harry described himself as a "deeply unhappy seventeen-year-old boy willing to try just about anything that upset the status quo."

Elsewhere in the autobiography, the fifth in line to the throne talks about his move from smoking tobacco to smoking marijuana during his days at Eton College, as well as revealing that he tasted magic mushrooms during a trip to America.

• Exclusive: Prince Harry and Meghan's security team says car chase 'could have been deadly'

Harry said he briefly stayed at actress Courteney Cox's house, where "we saw a huge box of black diamond mushroom bonbons" and he and a friend ate several and "washed them down with tequila."

The autobiography wasn't the first time Prince Harry talked about his recreational drug use when he was younger.

He previously spoke with Oprah Winfrey about how he abused drugs and alcohol in his late 20s and early 30s as a coping mechanism for coping with real-life pressures.

"He was willing to drink, he was willing to take drugs," he said. "I was willing to try to do the things that made me feel less like I did back then."

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