According to Republican Party strategist Scott Jennings, for Donald Trump to be successful in his debate with Joe Biden on June 27, he needs to rein himself in, “stay over the target” — and let the president talk. Sitting on a panel with Democratic strategist David Axelrod and CNN’s John Berman, Jennings stated Trump’s worst enemy too often is himself and he should let Biden take the lead — and possibly expose himself to new concerns about his age. After saying Trump needs to “avoid the disaster” of the 2020 debate, Jennings added that, this time, “The biggest risk is being overly aggressive, …