Donald Trump finally had a good day in court. The presumptive GOP nominee has often seemed embarrassed and infuriated by his first criminal trial, which has featured salacious exposés of his personal life and details of his alleged attempts to cover it up. But on Thursday, he got to savor his former fixer-turned-enemy Michael Cohen wobbling on the stand under a fearsome cross-examination. Cohen appeared to be tripped up over an account of a call he’d previously said under oath was to...