Donald Trump didn’t slip up when he insulted the host city of the Republican convention this week, according to the ex-aide of a GOP speaker. The former president was laying the groundwork in case a judge stops him from attending. “Milwaukee, where we are having our convention,is a horrible city,” he told congressional Republicans at a meeting Thursday. Almost immediately he tried to backtrack, including on Saturday with a Truth Social post in which he blamed the Democrats for a “fake story.” Want more breaking political news? Click for the latest headlines at Raw Story. “The Democrats are mak…