With Republicans trying to undercut President Joe Biden’s bid for re-election by pointing out his age, former South Carolina Gov. Nikki Haley (R) is using the same tactic on Donald Trump as she battles him for the 2024 GOP presidential nomination. According to a report from the Washington Post, it’s working and has knocked the embattled ex-president off message at the same time as he is fending off multiple costly criminal and civil trials. As the Post’s Mariana Alfaro wrote, the normally aggressive Trump is being forced to play “defense” after Haley made Trump’s age and his declining cognitiv…