andrew jackson shot someone. :shrugs: Thomas jefferson had affairs with his slaves... bill clinton did what he did, nixon actually did wiretapping. George W. made up facts to support his thesis... Obama basically did nothing for eight years. So, i mean, yeah, there is plent of precedence for bufoonery.
Actually, when you consider all the ****ty things presidents have done over the years, Trump claiming Obama wiretapped him might be the least damaging thing. Especially when you consider that zero rational people believe him.