By Tom Boggioni During an appearance on CNN on Saturday afternoon, former prosecutor Renato Mariotti said the likely reason Donald Trump adviser Kash Patel was given immunity to get him to answer questions before a grand jury is because investigators feel they have a criminal case against the former president. Earlier in the week the Washington Post reported that Patel was asked about the top secret documents Trump whisked away to his Mar-a-Lago resort that resulted in an FBI search of the Florida property. According to the Post, “National security prosecutors asked Patel about his public clai…