Article continues below advertisementLong before Prince Andrew was stripped of his HRH titles and military honors, he and Prince Harry got into a heated argument over Andrew's disdain for Meghan Markle.In Andrew Lownie's upcoming investigative biography of Andrew, Entitled: The Rise and Fall of the House of York, the author claimed Andrew told his nephew he was "bonkers" for not properly researching Meghan's background before bringing her into the royal family. He also said Meghan was "too old" for Harry and that marrying her would be his "biggest mistake ever.