Inaki Urdangarin was sentenced earlier this year to six years and three months in prison for fraud and tax evasion.
The case centered on accusations that he embezzled about 6 million euros ($7 million) in public funds.
His wife, Princess Cristina, was absolved in the case but ordered to pay a fine.
The state prosecutor appealed the verdict before the Supreme Court and today called for his sentence to be raised to up to 14 years and six months, chiefly for embezzlement.
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