The Heritage Foundation sued the Department of Homeland Security and demanded it release Prince Harry's visa application after he admitted illegal drug use in his book.

Duke of Sussex's visa records will remain a secret despite his past drug use, after a Conservative think tank lost a lawsuit.

Prince Harry may have gone public with his drug taking in his best-selling memoir, but his U.S. visa application will remain private, a judge has decided.U.S. District Court Judge Carl Nichols on Monday knocked back a lawsuit from the Heritage Foundation trying to force the government to release the exiled royal’s application to check if there was any mention of drug use.

Harry, who traveled to New York without Meghan Markle, said Princess Diana’s legacy is “extremely important,” as he talked with award recipients on Monday.

"My mother would have been horrified that anyone’s children or grandchildren would live in a world still infested with mines.”