Trump pardons ex-media mogul Conrad Black

US President Donald Trump has signed a full pardon for former media mogul Conrad Black, who was convicted in 2007 of fraud and obstruction of justice and spent three-and-a-half years in prison, the White House said.

Black, 74, a Canadian-born British citizen, once ran an international newspaper empire that included the Chicago Sun-Times, Britain's Daily Telegraph and the Jerusalem Post.

"Lord Black's case has attracted broad support from many high-profile individuals who have vigorously vouched for his exceptional character," the White House said in a statement announcing the pardon.

He was found guilty in the United States in 2007 of scheming to siphon off millions of dollars from the sale of newspapers owned by Hollinger Inc, where he was chief executive and chairman.

Two of his three fraud convictions were later voided, and his sentence was shortened. He was released from a Florida prison in May 2012 and deported from the United States.

The office of Canadian Prime Minister Justin Trudeau declined to comment.